7.5

CVE-2021-36377: fedoraproject fedora Improper Certificate Validation

Modified
AliasesMGASA-2021-0491UBUNTU-CVE-2021-36377DEBIAN-CVE-2021-36377
Published 12-07-2021Last modified 04-08-2024

Vulnerability summary

CVE-2021-36377 is a high (CVSS 7.5) Improper Certificate Validation vulnerability in fedoraproject fedora. EPSS estimates a 0.57% chance of exploitation in the next 30 days, higher than 46.6% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.57%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 12-07-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Fossil before 2.14.2 and 2.15.x before 2.15.2 often skips the hostname check during TLS certificate validation.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.57%

Chance of exploitation in the next 30 days

Percentile

47%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.57% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • fossil< 1:2.15.2-1
Fedoraproject1 product
Fossil-scm1 product
  • fossil< 2.14.2 | ≥ 2.15.0, < 2.15.2
Mageia1 product
  • fossil< 2.14.2-1.mga8
Ubuntu1 product
  • fossilAll versions (No fix recorded)

5 vendors · 5 products

References

10 links