No exploitation reportedFix available

CVE-2022-42905

Q: Is CVE-2022-42905 actively exploited?

Active exploitation of CVE-2022-42905 has not been confirmed. Its EPSS score was 2.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2022-42905?

CVE-2022-42905 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

No exploitation reported by the sources we read.

Published2022-11-07
Fixed in5.5.2
WeaknessCWE-125

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In wolfSSL before 5.5.2, if callback functions are enabled (via the WOLFSSL_CALLBACKS flag), then a malicious TLS 1.3 client or network attacker can trigger a buffer over-read on the heap of 5 bytes. (WOLFSSL_CALLBACKS is only intended for debugging.)

Timeline

dates in UTC

2022-11-0700:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2022-42905?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2022-42905?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Wolfssl

Branch	Affected	Fixed in	Source
5.5	< 5.5.2	5.5.2	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Update Wolfssl to 5.5.2

Advisories and patches

github.comRelease Notes
github.comRelease Notes
www.wolfssl.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-05-02
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.19.12025-05-02
NVDCVSS 3.19.1read 2026-10-23
CISA-ADPweakness (CWE)CWE-1252025-05-02
NVDweakness (CWE)CWE-125read 2026-10-23
FIRST EPSSEPSS score2.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Published: 2022-11-07
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2022-42905?

Is CVE-2022-42905 actively exploited?

Active exploitation of CVE-2022-42905 has not been confirmed. Its EPSS score was 2.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2022-42905?

CVE-2022-42905 has a CVSS v3 base score of 9.1 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H.

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