CVE intelligence and bounded remediation

CVE-2022-20713 — Cisco Firepower Threat Defense security vulnerability

Medium CVSS 6.1

A vulnerability in the VPN web client services component of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to conduct browser-based attacks against users of an affected device. This vulnerability is due to improper validation of input that is passed to the VPN web client services component before being returned to the browser that is in use. An attacker could exploit this vulnerability by persuading a user to visit a website that is designed to pass malicious requests to a device that is running Cisco ASA Software or Cisco FTD Software and has web services endpoints supporting VPN features enabled. A successful exploit could allow the attacker to reflect malicious input from the affected device to the browser that is in use and conduct browser-based attacks, including cross-site scripting attacks. The attacker could not directly impact the affected device.

Severity
Medium
CVSS
6.1 (3.1)
Published
2022-08-10
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-444, CWE-79

Affected products

  • cisco / firepower_threat_defense / 6.2.3
  • cisco / firepower_threat_defense / 6.2.3.1
  • cisco / firepower_threat_defense / 6.2.3.2
  • cisco / firepower_threat_defense / 6.2.3.3
  • cisco / firepower_threat_defense / 6.2.3.4
  • cisco / firepower_threat_defense / 6.2.3.5

Showing 6 representative product identities from 221 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

HTTP request smuggling and message-boundary ambiguity

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Check exposure

  • Inventory every proxy, CDN, gateway, load balancer, service mesh, and application server hop on affected request paths.
  • Compare documented parsing and normalization behavior for message length, transfer coding, duplicate headers, and protocol translation.
  • Identify connection reuse and which downstream services trust headers added by intermediaries.

Remediate safely

  • Update affected intermediaries and origin servers and align them on a single standards-compliant request framing policy.
  • Reject ambiguous length, transfer-coding, duplicate, malformed, and unsupported framing before forwarding.
  • Normalize or remove hop-by-hop and identity headers at one controlled boundary and add multi-hop regression tests.

Authoritative sources

Complete CVE record and remediation plan

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