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4.7mediumMedium

CVE-2020-3561

Cisco Adaptive Security Appliance

A vulnerability in the Clientless SSL VPN (WebVPN) of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to inject arbitrary HTTP headers in the responses of the affected system. The vulnerability is due to improper input sanitization. An attacker could exploit this vulnerability by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to conduct a CRLF injection attack, adding arbitrary HTTP headers in the responses of the system and redirecting the user to arbitrary websites.

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, someone has to be persuaded to take an action first.

Scoring

CVSS
4.7 (v3.1)
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:N
Weakness
CWE-93
Assigned by
psirt@cisco.com

Dates

Published
2020-10-21
Last modified
2026-08-11
Sources
NVD

Affected products

  • Cisco Adaptive Security Appliance- 9.6.4.35
  • Cisco Secure Firewall Threat Defense- 6.3.0.6, 6.4.0 - 6.4.0.10, 6.5.0 - 6.5.0.5, 6.6.0 - 6.6.1
  • Cisco Adaptive Security Appliance Software9.8.0 - 9.8.4.20, 9.9.0 - 9.9.2.80, 9.10.0 - 9.10.1.43, 9.12.0 - 9.12.3.9, 9.13.0 - 9.13.1.10, 9.14.0 - 9.14.1.10

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

References