Squid, when transparent interception mode is enabled, uses the HTTP Host header to…
Priority LOW 30CWE-264Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- High
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- Complete · None · None
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and Red Hat. Impact type from CWE-264.
Summary
Squid, when transparent interception mode is enabled, uses the HTTP Host header to determine the remote endpoint, which allows remote attackers to bypass access controls for Flash, Java, Silverlight, and probably other technologies, and possibly communicate with restricted intranet sites, via a crafted web page that causes a client to send HTTP requests with a modified Host header.
Why it matters now
EPSS 0.03089 87th percentileScored 2026-11-07
Fix Will not fix Red Hat: no fix planned
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 · 16
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:squid:squid_web_proxy_cache:2.7:*:*:*:*:*:*:* | 2.7 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:2.7.stable5:*:*:*:*:*:*:* | 2.7.stable5 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:2.7.stable6:*:*:*:*:*:*:* | 2.7.stable6 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0:*:*:*:*:*:*:* | 3.0 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre1:*:*:*:*:*:*:* | 3.0_pre1 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre2:*:*:*:*:*:*:* | 3.0_pre2 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre3:*:*:*:*:*:*:* | 3.0_pre3 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable1:*:*:*:*:*:*:* | 3.0_stable1 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable2:*:*:*:*:*:*:* | 3.0_stable2 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable3:*:*:*:*:*:*:* | 3.0_stable3 | Vulnerable | Squid |
- cpe:2.3:a:squid:squid_web_proxy_cache:2.7:*:*:*:*:*:*:* Versions 2.7 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:2.7.stable5:*:*:*:*:*:*:* Versions 2.7.stable5 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:2.7.stable6:*:*:*:*:*:*:* Versions 2.7.stable6 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0:*:*:*:*:*:*:* Versions 3.0 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre1:*:*:*:*:*:*:* Versions 3.0_pre1 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre2:*:*:*:*:*:*:* Versions 3.0_pre2 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre3:*:*:*:*:*:*:* Versions 3.0_pre3 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable1:*:*:*:*:*:*:* Versions 3.0_stable1 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable2:*:*:*:*:*:*:* Versions 3.0_stable2 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable3:*:*:*:*:*:*:* Versions 3.0_stable3 Vulnerable ·Squid
Show 6 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable4:*:*:*:*:*:*:* | 3.0_stable4 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable5:*:*:*:*:*:*:* | 3.0_stable5 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable6:*:*:*:*:*:*:* | 3.0_stable6 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable7:*:*:*:*:*:*:* | 3.0_stable7 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable12:*:*:*:*:*:*:* | 3.0_stable12 | Vulnerable | Squid |
| cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable13:*:*:*:*:*:*:* | 3.0_stable13 | Vulnerable | Squid |
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable4:*:*:*:*:*:*:* Versions 3.0_stable4 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable5:*:*:*:*:*:*:* Versions 3.0_stable5 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable6:*:*:*:*:*:*:* Versions 3.0_stable6 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable7:*:*:*:*:*:*:* Versions 3.0_stable7 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable12:*:*:*:*:*:*:* Versions 3.0_stable12 Vulnerable ·Squid
- cpe:2.3:a:squid:squid_web_proxy_cache:3.0_stable13:*:*:*:*:*:*:* Versions 3.0_stable13 Vulnerable ·Squid
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 4 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 5 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
Timeline
- 2026-10-02 Threatist record created from CVE-2009-0801
- 2026-10-03 Alias added: GHSA-w87g-c2c7-4fx5
References
Advisory 1
More Squid Web Proxy Cache vulnerabilities
- TI-2007-05954 The "cache update reply processing" functionality in Squid 2.x before 2.6.STABLE17 and… CVSS 2.0MEDIUM 5.0
Sources
- CVE-2009-0801 · CVE Program
- CVE-2009-0801 · NVD
- FIRST EPSS
- GHSA-w87g-c2c7-4fx5 · GitHub Advisory Database · CC BY 4.0
- CVE-2009-0801 · 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