CVE-2011-2721 json
Off-by-one error in the cli_hm_scan function in matcher-hash.c in libclamav in ClamAV before 0.97.2 allows remote attackers to cause a deni…
published 2011-08-05 15 y ago modified 2026-06-16 4 mo ago also EUVD-2011-2699
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.4%
- EPSS 3.4% chance of exploitation in 30 days, percentile 88%
- public exploits
- 0
- none known
Summary
Off-by-one error in the cli_hm_scan function in matcher-hash.c in libclamav in ClamAV before 0.97.2 allows remote attackers to cause a denial of service (daemon crash) via an e-mail message that is not properly handled during certain hash calculations.
Patch / fix
- clamav Debian 14, Debian 13, Debian 12 0.97.2+dfsg-1
debian advisories DEBIAN-CVE-2011-2721
- clamav openSUSE Tumbleweed 0.99.2-4.1
opensuse advisories openSUSE-SU-2024:10571-1
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2011-2721 updated cvss 4.3
AntiVirus: Off-by-one error by scanning message hashes
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
3.38% chance of exploitation in the next 30 days, higher than 88% of all scored CVEs (FIRST EPSS, 2026-11-09).
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-189 Numeric Errors
References
-
bugzilla.redhat.com
/show_bug.cgi?id=725694
patch
-
bugzilla.novell.com
/show_bug.cgi?id=708263
patch
-
openwall.com
/lists/oss-security/2011/07/26/3
mailing-list, patch
-
openwall.com
/lists/oss-security/2011/07/26/13
mailing-list, patch
-
wwws.clamav.net
/bugzilla/show_bug.cgi?id=2818
patch
-
lists.fedoraproject.org
/pipermail/package-announce/2011-November/068942.html
vendor-advisory
-
ubuntu.com
/usn/USN-1179-1
vendor-advisory
-
lists.fedoraproject.org
/pipermail/package-announce/2011-November/068940.html
vendor-advisory
-
lists.fedoraproject.org
/pipermail/package-announce/2011-November/068941.html
vendor-advisory
-
mandriva.com
/security/advisories?name=MDVSA-2011:122
vendor-advisory
-
secunia.com
/advisories/45382
third-party-advisory, vendor-advisory
- git.clamav.net /gitweb?p=clamav-devel.git%3Ba=blob_plain%3Bf=ChangeLog%3Bhb=clamav-0.97.2
-
securitytracker.com
/id?1025858
vdb-entry
-
secunia.com
/advisories/46717
third-party-advisory
-
exchange.xforce.ibmcloud.com
/vulnerabilities/68785
vdb-entry
- git.clamav.net /gitweb?p=clamav-devel.git%3Ba=commit%3Bh=4842733eb3f09be61caeed83778bb6679141dbc5
-
securityfocus.com
/bid/48891
vdb-entry
-
osvdb.org
/74181
vdb-entry
Sources
- CVE List CVE-2011-2721
- NVD CVE-2011-2721
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.