CVE-2022-20927Network attack vector

Authenticated reload via server-selected TLS parameters

Published Nov 10, 2022 · Updated Aug 3, 2024

Denial of service in Cisco ASA and FTD Software allows remote authenticated users to reload affected devices through crafted TLS servers. The SSL/TLS client mishandles memory when processing server-selected encryption parameters during device-initiated connections. Exploitation requires credentials and control of or influence over a TLS server the device connects to; success causes an unexpected reload.

CVSS severity7.7

High

EPSS probability0.53%

Next 30 days · Sep 16, 2026

Known exploitationUnconfirmed

Based on sourced intelligence

Hinoki checkNot available

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Summary

What happened

The record

CVE: CVE-2022-20927
Published: Nov 10, 2022
Updated: Aug 3, 2024

Vendor: ClamAV
Product: Cisco FirePOWER Services Software for ASA
Classifications: CWE-120

Attack vector: network
Privileges: authenticated

Timeline

How it unfolded

Nov 10, 2022CVE publishedPublication date reported by the CVE source.
Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

Affected versionversion=N/A

What conditions does exploitation require?

Attack vectornetwork

Required privilegesauthenticated

What is affected?

ClamAV · Cisco FirePOWER Services Software for ASAversion=N/A

ClamAV · Cisco Adaptive Security Appliance (ASA) Softwareversion=9.14.1; version=9.14.1.10; version=9.14.1.15; version=9.14.1.19; version=9.14.1.30; version=9.14.2; version=9.14.2.13; version=9.14.2.15; version=9.14.2.4; version=9.14.2.8; version=9.14.3; version=9.14.3.1; version=9.14.3.11; version=9.14.3.13; version=9.14.3.15; version=9.14.3.18; version=9.14.3.9; version=9.15.1; version=9.15.1.1; version=9.15.1.10; version=9.15.1.15; version=9.15.1.16; version=9.15.1.17; version=9.15.1.21; version=9.15.1.7

ClamAV · Cisco Firepower Threat Defense Softwareversion=6.6.0; version=6.6.0.1; version=6.6.1; version=6.6.3; version=6.6.4; version=6.6.5; version=6.6.5.1; version=6.6.5.2; version=6.7.0; version=6.7.0.1; version=6.7.0.2; version=6.7.0.3

Published CVSS scores

7.7CiscoCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:X/RL:X/RC:X

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026

Latest reporting daySep 16, 2026

Latest daily unique IPsUnavailable

Prior 30-day averageUnavailable

SourceShadowserver honeypots (KEV)

Vectornetwork

Privilegesauthenticated

Known exploitationUnconfirmed

Public exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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