CVE-2022-20927: A vulnerability in the SSL/TLS client of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower

Routine

HIGH 7.7MITIGATEUPGRADEMITIGATE

CVE-2022-20927 is a high-severity flaw (CVSS 7.7) affecting adaptive security appliance software, secure firewall threat defense, firepower services software for asa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A vulnerability in the SSL/TLS client of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to improper memory management when a device initiates SSL/TLS connections. An attacker could exploit this vulnerability by ensuring that the device will connect to an

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.7 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.5% (top 54%)
CISA exploited list	No
Weakness	CWE-120
Published	2022-11-15
Last modified	2026-08-11

Publisher (CNA): Cisco Systems, Inc. · Vendor: cisco

Last updated 2026-08-11 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-11-15 21:15 UTCPublished CVE record published
2026-08-11 19:33 UTCUpdated Record last modified

cisco adaptive security appliance software MITIGATE

Affected: 9.13.1 · 9.13.1.2 · 9.13.1.7 · 9.13.1.10 · 9.13.1.12 · 9.13.1.13 · 9.13.1.16 · 9.13.1.19

Fixed in: no fixed release known

Safe to downgrade to: a release before 9.13.1

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

cisco secure firewall threat defense UPGRADE

Affected: >= 6.5.0 and <= 6.5.0.5 · >= 6.7.0 and <= 6.7.0.3 · 6.6.0 · 6.6.0.1 · 6.6.1 · 6.6.3 · 6.6.4 · 6.6.5

Fixed in: newer than 6.7.0.3

Safe to downgrade to: a release before 6.5.0

1. Check installed version

apt-cache policy secure-firewall-threat-defense || rpm -q secure-firewall-threat-defense || secure-firewall-threat-defense --version

2. UPGRADE to newer than 6.7.0.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade secure-firewall-threat-defense

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade secure-firewall-threat-defense

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 6.5.0 (Debian / Ubuntu)

apt-cache madison secure-firewall-threat-defense sudo apt install secure-firewall-threat-defense=<VERSION_BEFORE_6.5.0> sudo apt-mark hold secure-firewall-threat-defense

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list secure-firewall-threat-defense sudo dnf downgrade secure-firewall-threat-defense-<VERSION_BEFORE_6.5.0> sudo dnf versionlock add secure-firewall-threat-defense

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

cisco firepower services software for asa MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firepower-services-software-for-asa || rpm -q firepower-services-software-for-asa || firepower-services-software-for-asa --version

No fixed or unaffected release known

Apply the vendor mitigation from the advisory, disable the affected feature, or restrict network access.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2022-20927?

adaptive security appliance software: mitigate or apply the listed mitigation; secure firewall threat defense: upgrade to newer than 6.7.0.3; firepower services software for asa: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2022-20927 being exploited?

CVE-2022-20927 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2022-20927 affect?

CVE-2022-20927 affects adaptive security appliance software, secure firewall threat defense, firepower services software for asa. Severity is high (CVSS 7.7). A vulnerability in the SSL/TLS client of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition on an aff

How urgent is CVE-2022-20927?

Priority 38/100. High severity

Software pages

Cisco ASA vulnerabilities · Cisco vulnerabilities

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References

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