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Vulnerability record · CVE-2020-25657 · published 12 January 2021

CVE-2020-25657: M2crypto project m2crypto vulnerability

M2crypto Project · M2crypto

A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality.

5.9 CVSS 3.1 Medium EPSS 1.7% · top 23.1% CWE-385 · CWE-385
5.9CVSS 3.1 base score, v2 4.3
1.7%EPSS exploitation probability, 30 days
NoNot in CISA KEV
4Affected product versions listed by NVD
2References
17 Jun 2026Last modified by NVD

Description

A flaw was found in all released versions of m2crypto, where they are vulnerable to Bleichenbacher timing attacks in the RSA decryption API via the timed processing of valid PKCS#1 v1.5 Ciphertext. The highest threat from this vulnerability is to confidentiality.

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

Affected products

4 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://bugzilla.redhat.com/show_bug.cgi?id=1889823 Issue TrackingThird Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1889823 Issue TrackingThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-25657), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.