CVE-2022-42905

Name: CVE-2022-42905
Creator: NVD / NIST
Published: 2022-11-07T00:15:09.643+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.1/10EPSS 1.96%

Last modified Jun 17, 2026

CVE-2022-42905 is a critical-severity vulnerability rated 9.1/10 on the CVSS scale. 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.). EPSS estimates a 1.96% chance of exploitation in the next 30 days.

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.)

Metrics

CVSS 3.1

9.1/10

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

EPSS Probability

1.96%

77.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Wolfssl	Wolfssl	< 5.5.2

References

http://packetstormsecurity.com/files/170610/wolfSSL-WOLFSSL_CALLBACKS-Heap-Buffer-Over-Read.htmlThird Party Advisory
http://seclists.org/fulldisclosure/2023/Jan/11Mailing List, Third Party Advisory
https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/
https://github.com/wolfSSL/wolfssl/releasesRelease Notes, Third Party Advisory
https://github.com/wolfSSL/wolfssl/releases/tag/v5.5.2-stableRelease Notes, Third Party Advisory
https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory
http://packetstormsecurity.com/files/170610/wolfSSL-WOLFSSL_CALLBACKS-Heap-Buffer-Over-Read.htmlThird Party Advisory
http://seclists.org/fulldisclosure/2023/Jan/11Mailing List, Third Party Advisory
https://blog.trailofbits.com/2023/01/12/wolfssl-vulnerabilities-tlspuffin-fuzzing-ssh/
https://github.com/wolfSSL/wolfssl/releasesRelease Notes, Third Party Advisory
https://github.com/wolfSSL/wolfssl/releases/tag/v5.5.2-stableRelease Notes, Third Party Advisory
https://www.wolfssl.com/docs/security-vulnerabilities/Vendor Advisory

Timeline

Published: Nov 7, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2022-42905?

How severe is CVE-2022-42905?

CVE-2022-42905 has a CVSS score of 9.1/10 (CRITICAL severity). The EPSS model estimates a 1.96% probability of exploitation in the next 30 days.

How do I fix CVE-2022-42905?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2022-42905?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST