UpHeron
All vulnerabilities

Servers and applications

CVE-2011-4006

The ESMTP inspection feature on Cisco Adaptive Security Appliances (ASA) 5500 series devices with software 8.2 through 8.5 allows remote attackers to cause a denial of service (CPU consumption) via an unspecified closing sequence, aka Bug ID CSCtt32565.

Severity
High 7.8
Published
2 May 2012
Last changed
16 Jun 2026
Added to UpHeron
1 Nov 2026
Exploit chance
1.3% in the next 30 daysHigher than 71% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
Improper input validation (CWE-20)
Attack
Over the network · No login needed
Attacker can
Take it down
CVSS vector
AV:N/AC:L/Au:N/C:N/I:N/A:C
Sources
NVD

Affected software

SoftwareAffected versions
Cisco ASA and Firepower Threat DefenseServers and applications · cpe:o:cisco:adaptive_security_appliance_software
  • Version 8.5(1.4)
  • Version 8.5(1)
  • Version 8.5
  • Version 8.4(2.11)
All 25 release lines
  • Version 8.2(1)
  • Version 8.2(2)
  • Version 8.2(3)
  • Version 8.2(3.9)
  • Version 8.2(4)
  • Version 8.2(4.1)
  • Version 8.2(4.4)
  • Version 8.2(5)
  • Version 8.2.1
  • Version 8.2.2
  • Version 8.2.2-interim
  • Version 8.2.3
  • Version 8.3(1)
  • Version 8.3(2)
  • Version 8.3.1
  • Version 8.3.1-interim
  • Version 8.3.2
  • Version 8.4
  • Version 8.4(1)
  • Version 8.4(1.11)
  • Version 8.4(2)
  • Version 8.4(2.11)
  • Version 8.5
  • Version 8.5(1)
  • Version 8.5(1.4)

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-4006
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-4006