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CVE-2009-3826

18
FAUCET Score

CVE-2009-3826 describes multiple buffer overflows in squidGuard 1.4, allowing remote attackers to bypass URL blocking. This vulnerability arises from discrepancies in buffer sizes between squidGuard and Squid, particularly when handling long redirect URLs. With a CVSS score of 5.0, it presents a medium severity risk, requiring no authentication and low attack complexity, leading to potential denial of service. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.4CPE matchmatch criteria
cpe:2.3:a:squidguard:squidguard:1.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:N/A:P

Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.83%
Probability of exploitation in next 30 days
EPSS Percentile
89.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0383 is in the 85th percentile among its peer group of 23,690 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 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 Advisories (1)

redhatCVE-2009-3826Moderate

squidGuard: buffer overflow in sgLog.c (CVE-2009-3700) and two URL filter bypass issues (CVE-2009-3826)

Oct 15, 2009

References

lists.opensuse.org / opensuse-security-announce/2010-08/msg00001.html
secunia.com / advisories/37107
Vendor Advisory
secunia.com / advisories/39679
securitytracker.com / id
exchange.xforce.ibmcloud.com / vulnerabilities/53922
debian.org / security/2010/dsa-2040
osvdb.org / 59164
securityfocus.com / archive/1/507440/100/0/threaded
securityfocus.com / bid/36800
Patch
squidguard.org / Downloads/Patches/1.4/Readme.Patch-20091019
Vendor Advisory
vupen.com / english/advisories/2009/3013
PatchVendor Advisory
vupen.com / english/advisories/2010/1043