UpHeron
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Servers and applications

CVE-2011-2721

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.

Severity
Medium 5.0
Published
5 Aug 2011
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
3.4% in the next 30 daysHigher than 88% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-189
Attack
Over the network · No login needed
Attacker can
Slow it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:P
Sources
NVD

Affected software

SoftwareAffected versions
ClamAVServers and applications · cpe:a:clamav:clamav
  • Version 0.97
  • Version 0.97-rc
  • Version 0.96.5
  • Version 0.96.4
All 117 release lines
  • Every version up to 0.97.1
  • Version 0.01
  • Version 0.02
  • Version 0.3
  • Version 0.03
  • Version 0.05
  • Version 0.8-rc3
  • Version 0.9-rc1
  • Version 0.10
  • Version 0.12
  • Version 0.13
  • Version 0.14-pre
  • Version 0.14
  • Version 0.15
  • Version 0.20
  • Version 0.21
  • Version 0.22
  • Version 0.23
  • Version 0.24
  • Version 0.51
  • Version 0.52
  • Version 0.53
  • Version 0.54
  • Version 0.60
  • Version 0.60p
  • Version 0.65
  • Version 0.66
  • Version 0.67
  • Version 0.67-1
  • Version 0.68
  • Version 0.68.1
  • Version 0.70-rc
  • Version 0.70
  • Version 0.71
  • Version 0.72
  • Version 0.73
  • Version 0.74
  • Version 0.75
  • Version 0.75.1
  • Version 0.80-rc
  • Version 0.80_rc
  • Version 0.80-rc1
  • Version 0.80-rc2
  • Version 0.80-rc3
  • Version 0.80-rc4
  • Version 0.80
  • Version 0.81-rc1
  • Version 0.81
  • Version 0.82
  • Version 0.83
  • Version 0.84-rc1
  • Version 0.84-rc2
  • Version 0.84
  • Version 0.85
  • Version 0.85.1
  • Version 0.86-rc1
  • Version 0.86
  • Version 0.86.1
  • Version 0.86.2
  • Version 0.87
  • Version 0.87.1
  • Version 0.88
  • Version 0.88.1
  • Version 0.88.2
  • Version 0.88.3
  • Version 0.88.4
  • Version 0.88.5
  • Version 0.88.6
  • Version 0.88.7
  • Version 0.88.7_p0
  • Version 0.88.7_p1
  • Version 0.90-rc1
  • Version 0.90-rc1.1
  • Version 0.90-rc2
  • Version 0.90-rc3
  • Version 0.90
  • Version 0.90.1
  • Version 0.90.1_p0
  • Version 0.90.2
  • Version 0.90.2_p0
  • Version 0.90.3
  • Version 0.90.3_p0
  • Version 0.90.3_p1
  • Version 0.91-rc1
  • Version 0.91-rc2
  • Version 0.91
  • Version 0.91.1
  • Version 0.91.2
  • Version 0.91.2_p0
  • Version 0.92
  • Version 0.92_p0
  • Version 0.92.1
  • Version 0.93
  • Version 0.93.1
  • Version 0.93.2
  • Version 0.93.3
  • Version 0.94
  • Version 0.94.1
  • Version 0.94.2
  • Version 0.95-rc1
  • Version 0.95-rc2
  • Version 0.95
  • Version 0.95-src1
  • Version 0.95-src2
  • Version 0.95.1
  • Version 0.95.2
  • Version 0.95.3
  • Version 0.96-rc1
  • Version 0.96-rc2
  • Version 0.96
  • Version 0.96.1
  • Version 0.96.2
  • Version 0.96.3
  • Version 0.96.4
  • Version 0.96.5
  • Version 0.97-rc
  • Version 0.97

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-2721
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-2721