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5.8mediumMedium

CVE-2021-1495

Cisco Secure Firewall Threat Defense

Multiple Cisco products are affected by a vulnerability in the Snort detection engine that could allow an unauthenticated, remote attacker to bypass a configured file policy for HTTP. The vulnerability is due to incorrect handling of specific HTTP header parameters. An attacker could exploit this vulnerability by sending crafted HTTP packets through an affected device. A successful exploit could allow the attacker to bypass a configured file policy for HTTP packets and deliver a malicious payload.

Exploitation status

  • A vendor advisory or patch reference has been published.

What the metrics mean

  • It is reachable over a network, without needing local access.
  • For an attacker who can reach it, no special conditions are needed to exploit it.
  • To exploit it, no account is needed.
  • Beyond that, no action by a user is required.

Scoring

CVSS
5.8 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:N
Weakness
CWE-755
Assigned by
psirt@cisco.com

Dates

Published
2021-04-29
Last modified
2026-08-11
Sources
NVD

Affected products

  • Cisco Secure Firewall Threat Defense- 6.4.0.12, 6.5.0 - 6.6.4, 6.7.0 - 6.7.0.2
  • Cisco Ios Xe16.12 - 16.12.5, 17.1 - 17.3.3, 17.4 - 17.4.1
  • Snort Snort- 2.9.17.1
  • Cisco 1100-4g\/6g Integrated Services Routerall versions
  • Cisco 1101 Integrated Services Routerall versions
  • Cisco 1109 Integrated Services Routerall versions
  • Cisco 1111x Integrated Services Routerall versions
  • Cisco 111x Integrated Services Routerall versions
  • Cisco 1120 Integrated Services Routerall versions
  • Cisco 1160 Integrated Services Routerall versions
  • Cisco 3000 Integrated Services Routerall versions
  • Cisco 4221 Integrated Services Routerall versions

As listed in the NVD configuration data. Not a statement about your estate.

References