Squid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 does not properly enforce "buffer…
Priority MEDIUM 43CWE-119Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · Partial
- Fix status
- No fix listed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.
Summary
Squid 3.0 through 3.0.STABLE16 and 3.1 through 3.1.0.11 does not properly enforce "buffer limits and related bound checks," which allows remote attackers to cause a denial of service via (1) an incomplete request or (2) a request with a large header size, related to (a) HttpMsg.cc and (b) client_side.cc.
Why it matters now
EPSS 0.23049 97th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 29
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:squid-cache:squid:3.0:*:pre1:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:pre2:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:pre3:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:pre4:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:pre5:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:pre6:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:pre7:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable1:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable10:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable11:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
- cpe:2.3:a:squid-cache:squid:3.0:*:pre1:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:pre2:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:pre3:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:pre4:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:pre5:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:pre6:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:pre7:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable1:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable10:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable11:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
Show 19 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:squid-cache:squid:3.0:*:stable12:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable13:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable14:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable15:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable2:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable3:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable4:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable5:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable6:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable7:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable8:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:*:stable9:*:*:*:*:* | 3.0 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:rc1:stable11:*:*:*:*:* | 3.0 rc1 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.0:rc4:*:*:*:*:*:* | 3.0 rc4 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.1:*:*:*:*:*:*:* | 3.1 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.1.0.1:*:*:*:*:*:*:* | 3.1.0.1 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.1.0.2:*:*:*:*:*:*:* | 3.1.0.2 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.1.0.3:*:*:*:*:*:*:* | 3.1.0.3 | Vulnerable | squid-cache |
| cpe:2.3:a:squid-cache:squid:3.1.0.4:*:*:*:*:*:*:* | 3.1.0.4 | Vulnerable | squid-cache |
- cpe:2.3:a:squid-cache:squid:3.0:*:stable12:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable13:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable14:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable15:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable2:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable3:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable4:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable5:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable6:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable7:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable8:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:*:stable9:*:*:*:*:* Versions 3.0 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:rc1:stable11:*:*:*:*:* Versions 3.0 rc1 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.0:rc4:*:*:*:*:*:* Versions 3.0 rc4 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.1:*:*:*:*:*:*:* Versions 3.1 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.1.0.1:*:*:*:*:*:*:* Versions 3.1.0.1 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.1.0.2:*:*:*:*:*:*:* Versions 3.1.0.2 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.1.0.3:*:*:*:*:*:*:* Versions 3.1.0.3 Vulnerable ·squid-cache
- cpe:2.3:a:squid-cache:squid:3.1.0.4:*:*:*:*:*:*:* Versions 3.1.0.4 Vulnerable ·squid-cache
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2009-2621
- 2026-10-03 Alias added: GHSA-g3mg-m63j-55xf
References
More squid-cache Squid vulnerabilities
- TI-2025-38486 Squid vulnerable to information disclosure via authentication credential leakage in error handling CVSS 3.1CRITICAL 10.0
- TI-2024-16845 Denial of Service in HTTP Header parser in squid proxy CVSS 3.1HIGH 7.5
- TI-2024-16566 SQUID-2024:1 Denial of Service in HTTP Chunked Decoding CVSS 3.1HIGH 8.6
- TI-2023-26921 Denial of Service in HTTP Message Processing in Squid CVSS 3.1HIGH 8.6
- TI-2023-27496 SQUID-2023:10 Denial of Service in HTTP Request parsing CVSS 3.1HIGH 8.6
- TI-2023-25306 Squid: denial of service in http digest authentication CVSS 3.1HIGH 8.6
Sources
- CVE-2009-2621 · CVE Program
- CVE-2009-2621 · NVD
- FIRST EPSS
- GHSA-g3mg-m63j-55xf · GitHub Advisory Database · CC BY 4.0
- CVE-2009-2621 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences