The squidclamav_check_preview_handler function in squidclamav.c in SquidClamav 5.x before 5.8 and 6.x before 6.7 passes an unescaped URL to…

published 2012-08-25 14 y ago modified 2026-06-16 4 mo ago also EUVD-2012-3457

cvss: 5.0; version 2.0, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 3.3%; EPSS 3.3% chance of exploitation in 30 days, percentile 88%
public exploits: 0; none known

The squidclamav_check_preview_handler function in squidclamav.c in SquidClamav 5.x before 5.8 and 6.x before 6.7 passes an unescaped URL to a system command call, which allows remote attackers to cause a denial of service (daemon crash) via a URL with certain characters, as demonstrated using %0D or %0A.

Patch / fix

links 1

github.com/darold/squidclamav@80f7445 commit

Exploit prediction

3.33% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

github.com https://github.com/darold/squidclamav/commit/80f74451f628264d1d9a1f1c0bbcebc932ba5e00 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

github.com /darold/squidclamav/commit/80f74451f628264d1d9a1f1c0bbcebc932ba5e00
exploit, patch
squidclamav.darold.net /news.html
vendor-advisory
secunia.com /advisories/49057
third-party-advisory, vendor-advisory
openwall.com /lists/oss-security/2012/08/16/4
mailing-list
osvdb.org /84138
vdb-entry
bugs.gentoo.org /show_bug.cgi?id=428778
openwall.com /lists/oss-security/2012/08/16/2
mailing-list
securityfocus.com /bid/54663
vdb-entry
freecode.com /projects/squidclamav/releases/346722

Sources

CVE List CVE-2012-3501
NVD CVE-2012-3501

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary