What is CVE-2022-43705?

CVE-2022-43705 is a critical-severity vulnerability in Botan Project, classified under Improper Certificate Validation. CVSS score: 9.1/10. Published 2022-11-27.

How severe is CVE-2022-43705?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Vulnerability in Botan Project

CVE-2022-43705

In Botan before 2.19.3, it is possible to forge OCSP responses due to a certificate verification error. This issue was introduced in Botan 1.11.34 (November 2016).

Vulnerability class: Improper Certificate Validation

Published 2022-11-27 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.8th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 38th percentile — 37.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.005 · change: +0.000

Affected products

Botan Project

Weakness classification (CWE)

CWE-295 — Improper Certificate Validation

References

github.com/randombit/botan/releases/tag/2.19.3 (Third Party Advisory, Release Notes)
github.com/randombit/botan/security/advisories/GHSA-4v9w-qvcq-6q7w (Third Party Advisory, Mitigation)

Frequently asked questions

What is CVE-2022-43705?: CVE-2022-43705 is a critical-severity vulnerability in Botan Project, classified under Improper Certificate Validation. CVSS score: 9.1/10. Published 2022-11-27.
How severe is CVE-2022-43705?: Critical severity. CVSS v3 base score is 9.1 out of 10.