5.3

CVE-2022-20940: cisco cisco firepower threat defense software Observable Discrepancy

CVSS: 5.3v3.1MediumModified
Published 10-11-2022Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2022-20940 is a medium (CVSS 5.3) Observable Discrepancy vulnerability in cisco cisco firepower threat defense software. EPSS estimates a 0.71% chance of exploitation in the next 30 days, higher than 52.8% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.71%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 10-11-2022
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A vulnerability in the TLS handler of Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to gain access to sensitive information. This vulnerability is due to improper implementation of countermeasures against a Bleichenbacher attack on a device that uses SSL decryption policies. An attacker could exploit this vulnerability by sending crafted TLS messages to an affected device, which would act as an oracle and allow the attacker to carry out a chosen-ciphertext attack. A successful exploit could allow the attacker to perform cryptanalytic operations that may allow decryption of previously captured TLS sessions to the affected device.

CVSS metrics

2 scores · 2 sources · 1 version

EPSS trend

Probability

0.71%

Chance of exploitation in the next 30 days

Percentile

53%

Versus all other CVEs

30-day change

+0.02 pp

From 0.69% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.71%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Cisco2 products
  • cisco firepower threat defense software6.2.3 | 6.2.3.1 | 6.2.3.2 | 6.2.3.3 | 6.2.3.4 | 6.2.3.5 | 6.2.3.6 | 6.2.3.7 | 6.2.3.8 | 6.2.3.10 | 6.2.3.11 | 6.2.3.9 | 6.2.3.12 | 6.2.3.13 | 6.2.3.14 | 6.2.3.15 | 6.2.3.16 | 6.2.3.17 | 6.2.3.18 | 6.6.0 | 6.6.0.1 | 6.6.1 | 6.6.3 | 6.6.4 | 6.6.5 | 6.6.5.1 | 6.6.5.2 | 6.4.0 | 6.4.0.1 | 6.4.0.3 | 6.4.0.2 | 6.4.0.4 | 6.4.0.5 | 6.4.0.6 | 6.4.0.7 | 6.4.0.8 | 6.4.0.9 | 6.4.0.10 | 6.4.0.11 | 6.4.0.12 | 6.4.0.13 | 6.4.0.14 | 6.7.0 | 6.7.0.1 | 6.7.0.2 | 6.7.0.3 | 7.0.0 | 7.0.0.1 | 7.0.1 | 7.0.1.1 | 7.0.2 | 7.0.2.1 | 7.0.3 | 7.1.0 | 7.1.0.1 | 7.1.0.2
  • secure_firewall_threat_defense≥ 6.2.3, ≤ 6.2.3.18 | ≥ 6.3.0, ≤ 6.3.0.5 | ≥ 6.4.0, ≤ 6.4.0.14 | ≥ 6.5.0, ≤ 6.5.0.5 | ≥ 6.7.0, ≤ 6.7.0.3 | ≥ 7.0.0, ≤ 7.0.3 | 6.6.0 | 6.6.0.1 | 6.6.1 | 6.6.3 | 6.6.4 | 6.6.5 | 6.6.5.1 | 6.6.5.2 | 7.1.0.0 | 7.1.0.1 | 7.1.0.2

1 vendor · 2 products

References

1 links