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CVE-2009-0801

18
FAUCET Score

CVE-2009-0801 describes a vulnerability in Squid web proxy cache, specifically when operating in transparent interception mode. Attackers can bypass access controls and potentially communicate with restricted intranet sites by manipulating the HTTP Host header within a crafted web page. The vulnerability has a CVSS score of 5.4, indicating a medium severity, with high confidentiality impact and requiring high attack complexity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.7CPE matchmatch criteria
cpe:2.3:a:squid:squid_web_proxy_cache:2.7:*:*:*:*:*:*:*
2.7.stable5CPE matchmatch criteria
cpe:2.3:a:squid:squid_web_proxy_cache:2.7.stable5:*:*:*:*:*:*:*
2.7.stable6CPE matchmatch criteria
cpe:2.3:a:squid:squid_web_proxy_cache:2.7.stable6:*:*:*:*:*:*:*
3.0CPE matchmatch criteria
cpe:2.3:a:squid:squid_web_proxy_cache:3.0:*:*:*:*:*:*:*
3.0_pre1CPE matchmatch criteria
cpe:2.3:a:squid:squid_web_proxy_cache:3.0_pre1:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.4MEDIUM

AV:N/AC:H/Au:N/C:C/I:N/A:N

Confidentiality Impact
COMPLETE
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
HIGH
Authentication
NONE
Exploitability Score
4.9
Impact Score
6.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.09%
Probability of exploitation in next 30 days
EPSS Percentile
86.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0309 is in the 80th percentile among its peer group of 19,953 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (3)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 4Fixed in: squid
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: squid
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: squid

Vendor Advisories (1)

redhatCVE-2009-0801Low

squid: remote bypass of access controls

Feb 23, 2009

References

kb.cert.org / vuls/id/435052
Third Party AdvisoryUS Government Resource
securityfocus.com / bid/33858