5.9

CVE-2020-25657: fedoraproject fedora Covert Timing Channel

CVSS: 5.9v3.1MediumModified
AliasesMGASA-2022-0274SUSE-FU-2024:1448-1SUSE-RU-2025:0796-1
Published 12-01-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-25657 is a medium (CVSS 5.9) Covert Timing Channel vulnerability in fedoraproject fedora. EPSS estimates a 1.76% chance of exploitation in the next 30 days, higher than 77.6% of scored vulnerabilities.

Overall risk
24/100
0100
Low · default modelHow is this calculated?
CVSS score
5.9/10
010
Medium · v3.1 (NVD)
EPSS score
1.76%
0%100%
Low · +0.02 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1
RHSA-2021:1169

Timeline

  1. 12-01-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

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 metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

1.76%

Chance of exploitation in the next 30 days

Percentile

78%

Versus all other CVEs

30-day change

+0.02 pp

From 1.74% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.76%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Suse53 products
  • python-M2Crypto&distro=SUSE Enterprise Storage 6< 0.35.2-150000.3.14.1
  • python-M2Crypto&distro=SUSE Enterprise Storage 7< 0.35.2-150000.3.14.1
  • python-M2Crypto&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS< 0.35.2-150000.3.14.1
  • python-M2Crypto&distro=SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS< 0.35.2-150000.3.14.1
  • python-M2Crypto&distro=SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS< 0.35.2-150000.3.14.1
Opensuse5 products
  • python-M2Crypto&distro=openSUSE Leap 15.3< 0.35.2-150000.3.14.1
  • python-M2Crypto&distro=openSUSE Leap 15.4< 0.38.0-150400.3.3.1 | < 0.35.2-150000.3.14.1 | < 0.38.0-150400.3.6.1
  • python-M2Crypto&distro=openSUSE Leap 15.5< 0.40.0-150400.3.9.1
  • python-M2Crypto&distro=openSUSE Leap Micro 5.2< 0.35.2-150000.3.14.1
  • python3-M2Crypto&distro=openSUSE Leap 15.6< 0.44.0-150600.19.3.1
Redhat2 products
Debian1 product
  • m2crypto< 0.38.0-4
Fedoraproject1 product
Mageia1 product
  • python-m2crypto< 0.38.0-4.mga8
Ubuntu1 product
  • m2cryptoAll versions (No fix recorded)

7 vendors · 64 products

References

24 links
Show all 24 references