CVE-2026-20030

Executive Summary

CVE-2026-20030 describes a critical SQL injection vulnerability class (CWE-89) affecting Cisco Crosswork, a network automation and assurance platform. The NVD description indicates this was discovered during an internal Cisco security review and addressed in a "software hardening release," though no specific affected version or patch version is disclosed in the available data. With a CVSS 3.1 base score of 10.0, the vulnerability is remotely exploitable without authentication and carries potential for full confidentiality, integrity, and availability compromise — making this a maximum-severity issue for any organization operating Cisco Crosswork in production. As of this writing, no public exploit code has been confirmed, and the vulnerability is not listed on CISA's Known Exploited Vulnerabilities catalog.

Technical Analysis

The vulnerability is classified under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command), commonly known as SQL injection. Cisco's internal security review identified improper handling of user-controlled input that is incorporated into SQL queries without adequate sanitization or parameterized query usage.

While the NVD description does not disclose the specific module, endpoint, or parameter names involved, the vulnerability class implies the following mechanism:

1. Input Handling Failure: The application receives user-supplied data (via HTTP request parameters, API payloads, or other input channels) and concatenates it directly into SQL statements rather than using parameterized queries or prepared statements.

2. SQL Injection Vector: An attacker crafts malicious input containing SQL metacharacters (e.g., single quotes, comment delimiters, UNION operators) to alter the structure of the executed SQL query. This allows the attacker to append additional SQL clauses, read from unrelated tables, or invoke database functions.

3. Attack Surface: The CVSS vector AV:N/AC:L/PR:N/UI:N indicates the vulnerability is exploitable remotely over the network, requires no authentication, and needs no user interaction. Combined with S:C (scope change), the impact can extend beyond the initially compromised component to other parts of the system.

4. Internal Review Context: The description explicitly states this was found through Cisco's proactive internal security review, suggesting the vulnerability is not publicly known beyond the CVE disclosure and may have been present in the codebase for an unknown duration.

Given Cisco's track record with similar findings in network management platforms, the SQL injection likely resides in a web-based management interface, REST API endpoint, or reporting module that processes user-supplied filters, search terms, or configuration parameters.

Exploitation Scenarios

Attack Chain (inferred from vulnerability class — no public PoC available):

1. Reconnaissance / Target Identification: An attacker performs internet-wide scanning for Cisco Crosswork management interfaces using Shodan or similar tools. Identifying the platform may require fingerprinting HTTP responses, TLS certificates, or specific banner information. Once a target is found, the attacker enumerates accessible web endpoints and API routes.

2. Flaw Triggering: The attacker identifies an input field that is processed by the application and reflected in a SQL query. Common examples in network management platforms include: device search filters, network topology query parameters, reporting date ranges, or log filtering options. The attacker injects SQL metacharacters (e.g., ' OR 1=1--) into these fields to test for injection behavior.

3. Payload Execution: At the vulnerability-class level, the attacker escalates from boolean-based detection to data extraction. Typical payloads include:

   • UNION SELECT statements to extract database credentials or configuration data
   • WAITFOR DELAY or pg_sleep() calls for time-based blind confirmation
   • Error-based injection to enumerate database schema
   • Stacked queries to invoke stored procedures or write files (if the database permits)

4. Post-Exploitation Impact: Successful exploitation with the C:H/I:H/A:H impact ratings allows the attacker to:

   • Extract credential hashes, API keys, and authentication tokens from database tables
   • Modify network configuration data, potentially causing service disruption or redirecting traffic
   • Escalate to operating system command execution if the database runs with elevated privileges
   • Achieve lateral movement into the broader network, as Cisco Crosswork typically holds sensitive topology and device management data

The S:C (scope change) component indicates SQL injection may be leveraged to jump from the database layer to the underlying host or adjacent components, potentially enabling full remote code execution.

Impact Assessment

Confidentiality Impact (HIGH): The CVSS subscores rate confidentiality impact as high. Cisco Crosswork stores network topology data, device configurations, credentials, and operational telemetry. An attacker exploiting this SQL injection can enumerate and exfiltrate the entire database contents.

Integrity Impact (HIGH): SQL injection permits data modification. An attacker could alter device configurations, change route policies, inject malicious configuration data, or manipulate performance metrics displayed to network operators — creating a dangerous "false reality" scenario where the network appears healthy while under attacker control.

Integrity Impact — Availability (HIGH): Attackers could delete database records, corrupt configuration repositories, or execute resource-intensive SQL operations to degrade platform responsiveness. In worst-case scenarios, dropping tables or corrupting schemas would render the management platform inoperable.

Business Impact: For service providers and large enterprises, Cisco Crosswork is operationally critical. The platform is used for network automation, path computation, and service assurance. Compromise could result in:

• Loss of network visibility and management capability
• Regulatory compliance violations (network data exposure)
• Brand and customer trust damage
• Significant recovery costs

Blast Radius: The S:C scope change means the impact extends beyond the vulnerable SQL component into other security domains — potentially the underlying host OS, adjacent microservices, or the managed network infrastructure itself.

Affected Systems: The NVD data does not specify affected versions. Organizations should assume all versions of Cisco Crosswork released prior to the undisclosed hardening release are potentially vulnerable.

Detection Guidance

Sigma Rule

title: Cisco Crosswork SQL Injection Attempt
id: 4f2a6c8e-9b3d-4f5a-8c2e-7d1a9b3c5e8f
status: experimental
description: Detects potential SQL injection attempts against Cisco Crosswork management interfaces based on SQL metacharacters in HTTP requests
author: Valters IT Cyber Defense Unit
date: 2026/02/08
logsource:
  category: webserver
  product: cisco
detection:
  selection:
    cs-uri-query|contains:
      - "' OR"
      - "' UNION"
      - "' SELECT"
      - "WAITFOR"
      - "pg_sleep"
      - "SLEEP("
      - "' AND 1=1"
      - "' AND 1=2"
      - "/*"
      - "char("
      - "concat("
      - "information_schema"
      - "0x"
    cs-method:
      - GET
      - POST
  filter_known_good:
    cs-uri-query|contains:
      - "dashboard"
      - "static"
      - "images"
  condition: selection and not filter_known_good
fields:
  - client_ip
  - cs-uri-query
  - c-ip
  - cs-username
falsepositives:
  - Legitimate query strings containing SQL keywords in operational contexts
  - Security scanning tools using identical fingerprints
level: high

YARA Rule

rule Cisco_Crosswork_SQLi_Payloads
{
    meta:
        author = "Valters IT Cyber Defense Unit"
        date = "2026-02-08"
        description = "Detects SQL injection payload patterns commonly used against Cisco Crosswork"
        cve = "CVE-2026-20030"
        severity = "critical"

    strings:
        $s1 = "UNION SELECT" ascii wide nocase
        $s2 = "OR 1=1" ascii wide nocase
        $s3 = "WAITFOR DELAY" ascii wide nocase
        $s4 = "pg_sleep" ascii wide nocase
        $s5 = "information_schema.tables" ascii wide nocase
        $s6 = "' OR '" ascii wide nocase
        $s7 = "conv(" ascii wide nocase
        $s8 = "chr(" ascii wide nocase
        $s9 = "substring(" ascii wide nocase
        $s10 = "cast(" ascii wide nocase
        $s11 = "EXEC" ascii wide nocase
        $s12 = "xp_cmdshell" ascii wide nocase
        $s13 = "0x73656c656374" ascii wide  // hex-encoded "select"

    condition:
        (uint16(0) == 0x4D5A or uint16(0) == 0x5A4D) and
        3 of them
}

Suricata IDS Rule

alert http any any -> $HOME_NET any (
    msg:"ET EXPLOIT Cisco Crosswork SQL Injection Attempt (CVE-2026-20030)";
    flow:established,to_server;
    content:"GET /"; http_method;
    content:"Crosswork"; http_host;
    content:"'"; http_uri;
    pcre:"/(?:'|%27)(?:\s|%20)*(?:OR|AND|UNION|SELECT|INSERT|UPDATE|DELETE|WAITFOR|SLEEP)/i";
    pcre:"/(?:information_schema|pg_catalog|sqlmap|--|#|\/\*)/i";
    classtype:web-application-attack;
    sid:2026200301;
    rev:1;
    metadata:created_at 2026_02_08, cve CVE-2026-20030;
)

alert http any any -> $HOME_NET any (
    msg:"ET EXPLOIT Cisco Crosswork Time-Based SQL Injection (CVE-2026-20030)";
    flow:established,to_server;
    content:"POST"; http_method;
    content:"Crosswork"; http_host;
    pcre:"/(?:pg_sleep|SLEEP|BENCHMARK|waitfor|WAITFOR)/i";
    classtype:web-application-attack;
    sid:2026200302;
    rev:1;
    metadata:created_at 2026_02_08, cve CVE-2026-20030;
)

Elastic Detection

event.category : ("network" or "web" or "http") and
event.outcome : ("success" or "failure") and
http.request.body.content : (
  "*' OR '*" or
  "*UNION SELECT*" or
  "*WAITFOR DELAY*" or
  "*pg_sleep*" or
  "*information_schema*" or
  "*SLEEP(*"
) or
url.path : ("*/rest/*" or "*/api/*") and
url.query : (
  "*' OR*" or
  "*' AND*" or
  "*' UNION*" or
  "*;--*" or
  "*/*"
) and
host.vendor : "cisco"

Splunk SPL Query

index>=* sourcetype=iis OR sourcetype=apache OR sourcetype=cisco:crosswork
  (uri_query="*' OR*" OR uri_query="*' AND*" OR uri_query="*UNION SELECT*" 
   OR uri_query="*WAITFOR*" OR uri_query="*pg_sleep*" OR uri_query="*information_schema*"
   OR uri_query="*SLEEP(*" OR uri_query="*--*")
  OR (form_data="*' OR*" OR form_data="*' AND*" OR form_data="*UNION*" 
      OR form_data="*WAITFOR*" OR form_data="*SLEEP(*") 
  OR (url="*/crosswork*" OR url="*/network*" OR url="*/api*")
| table _time, src_ip, dest_ip, dest_port, uri, uri_query, form_data, http_method, http_user_agent, status
| sort -_time
| eval threat_score = case(
    match(uri_query, "UNION SELECT"), 5,
    match(uri_query, "information_schema"), 5,
    match(uri_query, "pg_sleep"), 5,
    match(uri_query, "WAITFOR"), 4,
    match(uri_query, "OR 1=1"), 4,
    match(uri_query, "SLEEP\\("), 4,
    true(), 1)
| where threat_score >= 4

Wazuh OSSEC Rule

<group name="cisco,crosswork,sql_injection,">
  <rule id="747065" level="14">
    <decoded_as>json</decoded_as>
    <field name="url">\.(?:php|jsp|do|action)|/api/|/rest/</field>
    <regex>('|\%27)(\s)*(\%|)(OR|AND|UNION|SELECT|INSERT|UPDATE|DELETE)</regex>
    <description>Cisco Crosswork SQL injection attempt detected (CVE-2026-20030)</description>
    <group>attack,sql_injection,</group>
    <mitre>
      <id>T1190</id>
    </mitre>
  </rule>

  <rule id="747066" level="14">
    <decoded_as>json</decoded_as>
    <regex>(pg_sleep|SLEEP\(|WAITFOR|BENCHMARK|information_schema)</regex>
    <description>Possible time-based/blind SQL injection against Cisco Crosswork (CVE-2026-20030)</description>
    <group>attack,sql_injection,</group>
    <mitre>
      <id>T1190</id>
    </mitre>
  </rule>

  <rule id="747067" level="10">
    <decoded_as>json</decoded_as>
    <field name="srcip">!127.0.0.1</field>
    <regex>(\%27|\')(\s)*(\%|)(OR|AND|UNION|--|#)</regex>
    <description>Cisco Crosswork HTTP request with suspicious SQL characters (CVE-2026-20030)</description>
    <group>attack,reconnaissance,sql_injection,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch Confidence: 0/4 — UNPATCHED (no patch evidence from any tracked source)

1. Immediate Mitigations (no patch available)

• Network Segmentation: Restrict all access to Cisco Crosswork management interfaces. Place the platform behind a bastion host or jump server with IP allowlisting. Do not expose the management interface directly to the internet.
• Web Application Firewall (WAF) Deployment: Deploy a WAF in front of the Cisco Crosswork interface with active SQL injection detection rules. Configure the WAF in blocking mode for signatures matching SQL metacharacter injection patterns.
• Access Control Hardening: If the CVSS vector is accurate (PR:N — no privileges required), enforce network-level access controls that entirely restrict unauthenticated reachability, compensating for the authentication bypass aspect of the vulnerability.
• Database Least Privilege: Verify the database account used by Cisco Crosswork runs with minimum required privileges. Revoke xp_cmdshell, file system access, and administrative rights from the application's DB account.
• Monitoring Alerting: Enable real-time detection using the rules provided above. Monitor for SQL injection patterns, failed login spikes, and unexpected database queries.

2. Patch / Upgrade Steps

• Contact Cisco TAC: Engage Cisco Technical Assistance Center to obtain the referenced "software hardening release." While the CVE is publicly disclosed, the specific version containing the fix has not been identified in the NVD data.
• Subscribe to Cisco Advisories: Monitor Cisco Security Advisories (https://sec.cloudapps.cisco.com/security/center/publicationListing.x) for the official advisory associated with CVE-2026-20030.
• Version Verification: Once the patched version is identified, perform a staged upgrade in a test environment before production deployment.
• Post-Patch Validation: After upgrading, run the detection rules above in monitoring mode to confirm no residual injection vectors remain.

3. Long-Term Hardening

• Input Validation Review: Cisco customers should pressure Cisco to release full disclosure of the affected modules and endpoints so deployment teams can perform configuration-level input validation as defense-in-depth.
• Database Account Management: Rotate credentials for the database accounts, users, and service accounts used by Cisco Crosswork. Review database audit logs for signs of prior unauthorized access.
• Immutable Infrastructure: Deploy Cisco Crosswork in an immutable infrastructure model using Infrastructure-as-Code (IaC), enabling rapid rebuild from known-good state if compromise occurs.
• Regular SQL Injection Testing: Include Cisco Crosswork in annual penetration testing cycles with a specific focus on SQL injection testing against all input vectors, API endpoints, and web management interfaces.
• Vendor Communication: Maintain open communication with Cisco regarding the timeline for the hardening release. The "4/4 patch confidence" scoring indicates significant uncertainty — validate directly with the vendor that the final fix covers all internal findings.

References

1. NVD Entry: https://nvd.nist.gov/vuln/detail/CVE-2026-20030 (National Vulnerability Database — official CVE details, CVSS score, and description)
2. CWE-89 Description: https://cwe.mitre.org/data/definitions/89.html (Common Weakness Enumeration — SQL injection class details)
3. Cisco Security Advisories Portal: https://sec.cloudapps.cisco.com/security/center/publicationListing.x (Monitor for the official advisory — expected but not yet published)
4. CISA Known Exploited Vulnerabilities Catalog: https://www.cisa.gov/known-exploited-vulnerabilities-catalog (CVE-2026-20030 is NOT currently listed)
5. MITRE ATT&CK Framework: https://attack.mitre.org/techniques/T1190/ (T1190 — Exploit Public-Facing Application technique reference)

Threat Actor Activity: No known threat actor campaigns have been publicly attributed to this CVE as of this writing. The description's reference to an internal Cisco security review suggests the vulnerability was identified proactively rather than through observed exploitation. PoC/exploit status is UNKNOWN, and there is no evidence of exploitation in the wild from any tracked source. However, given the CVSS 10.0 severity and the historical pattern of rapid weaponization of SQL injection flaws in network management platforms, the risk of imminent exploit development is elevated. SOC teams should treat any unauthenticated access attempt to Cisco Crosswork interfaces as potentially malicious.