Is CVE-2021-34787 in the CISA KEV catalog?

No. CVE-2021-34787 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-34787?

CVE-2021-34787 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2021-34787?

CVE-2021-34787 has an EPSS score of 1.00% (59th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-34787?

Upgrade adaptive security appliance to 9.8.4.40 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-34787

MEDIUM

5.3

CVSS v3

NVD

Description

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.

CWE-183 CWE-755

How to fix

Remediation Available

adaptive security applianceNVD

Affected:< 9.8.4.40Fixed in:9.8.4.40CVE-2021-34787derived from NVD

adaptive security appliance softwareNVD

Affected:>= 9.16.0, < 9.16.1.28Fixed in:9.16.1.28CVE-2021-34787derived from NVD

firepower threat defenseNVD

Affected:>= 7.0.0, < 7.0.1Fixed in:7.0.1CVE-2021-34787derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityLow

AvailabilityNone

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Exploit Intelligence

1.00%probability of exploitation in 30 days

59thpercentile

Moderate risk: more likely to be exploited than 59% of all known CVEs.

References

Vendor Advisory1

tools.cisco.com

Embed a live status badge for CVE-2021-34787

Markdown

[![CVE-2021-34787](https://tridentstack.com/cve/badge/CVE-2021-34787.svg)](https://tridentstack.com/cve/CVE-2021-34787)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-34787"><img src="https://tridentstack.com/cve/badge/CVE-2021-34787.svg" alt="CVE-2021-34787"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.