CVE intelligence and bounded remediation

CVE-2021-34787 — Cisco Adaptive Security Appliance security vulnerability

Medium CVSS 5.3

A vulnerability in the identity-based firewall (IDFW) rule processing feature of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to bypass security protections. This vulnerability is due to improper handling of network requests by affected devices configured to use object group search. An attacker could exploit this vulnerability by sending a specially crafted network request to an affected device. A successful exploit could allow the attacker to bypass access control list (ACL) rules on the device, bypass security protections, and send network traffic to unauthorized hosts.

Severity
Medium
CVSS
5.3 (3.1)
Published
2021-10-27
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-183, CWE-755

Affected products

  • cisco / adaptive_security_appliance
  • cisco / firepower_threat_defense
  • cisco / adaptive_security_appliance_software
  • cisco / asa_5512-x_firmware / 009.009
  • cisco / asa_5512-x_firmware / 009.012
  • cisco / asa_5505_firmware / 009.009

Showing 6 representative product identities from 25 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

General vulnerability remediation

This catalog composition supplies bounded fallback guidance. Explicitly reviewed curated workflows load with the complete record below.

Check exposure

  • Confirm the affected component, deployment paths, reachable interfaces, and enabled features from inventories and configuration, without probing production destructively.
  • Compare the advisory's affected conditions with the repository lockfiles, build manifests, artifacts, and runtime inventory.
  • Identify data sensitivity, trust boundaries, and privilege level for every confirmed affected deployment.

Remediate safely

  • Apply a vendor-supported fix or remove the affected component or feature; record the selected change and its source in the repository.
  • Update direct and transitive dependency locks, generated artifacts, deployment manifests, and asset inventories together.
  • Add a regression test for the documented unsafe condition using inert inputs and preserve rollback instructions.

Authoritative sources

Complete CVE record and remediation plan

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