Resource exhaustion in Cisco Email Security Appliance Firmware

CVE-2019-15961

A vulnerability in the email parsing module Clam AntiVirus (ClamAV) Software versions 0.102.0, 0.101.4 and prior could allow an unauthenticated, remote attacker to cause a denial of service condition on an affected device. The vulnerability is due to inefficient MIME parsing routines that result in extremely long scan times of specially formatted email files. An attacker could exploit this vulnerability by sending a crafted email file to an affected device. An exploit could allow the attacker to cause the ClamAV scanning process to scan the crafted email file indefinitely, resulting in a denial of service condition.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

EPSS: 0.031 (87.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

  • psirt@cisco.com (x_refsource_CISCO, Exploit, vendor-advisory, Issue Tracking, Vendor Advisory)
  • psirt@cisco.com (x_refsource_CISCO, vendor-advisory, Third Party Advisory)
  • psirt@cisco.com (x_refsource_UBUNTU, vendor-advisory, Third Party Advisory)
  • psirt@cisco.com (mailing-list, x_refsource_MLIST, Mailing List, Third Party Advisory)
  • psirt@cisco.com (vendor-advisory, Third Party Advisory, x_refsource_GENTOO)

Frequently asked questions

What is CVE-2019-15961?
CVE-2019-15961 is a high-severity vulnerability in Cisco Email Security Appliance Firmware, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2020-01-15.
How severe is CVE-2019-15961?
High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2019-15961 known to be exploited?
2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.