7.5

CVE-2021-33645: fedoraproject fedora

Modified
AliasesUBUNTU-CVE-2021-33645DEBIAN-CVE-2021-33645
Published 09-08-2022Last modified 03-11-2025

Vulnerability summary

CVE-2021-33645 is a high (CVSS 7.5) vulnerability in fedoraproject fedora. EPSS estimates a 2.02% chance of exploitation in the next 30 days, higher than 80.9% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 2% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
2.02%
0%100%
Low · +0.11 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 5 · Related 2
DLA-4033-1MGASA-2022-0335OPENSUSE-SU-2026:11092-1RHSA-2023:2898USN-7398-1

Timeline

  1. 09-08-2022
    PublishedVulnerability first disclosed.
  2. 03-11-2025
    Last modifiedVulnerability information updated.

Description

The th_read() function doesn’t free a variable t->th_buf.gnu_longlink after allocating memory, which may cause a memory leak.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

2.02%

Chance of exploitation in the next 30 days

Percentile

81%

Versus all other CVEs

30-day change

Increase +0.11 pp

From 1.91% on 04-10-2026

04-10-202603-11-2026

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

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian1 product
  • libtar< 1.2.20-8+deb12u1
Fedoraproject1 product
Feep1 product
Openatom1 product
Ubuntu1 product
  • libtar< 1.2.20-4ubuntu0.1~esm1 | < 1.2.20-7ubuntu0.1~esm1 | < 1.2.20-8ubuntu0.20.04.1 | < 1.2.20-8ubuntu0.22.04.1 | < 1.2.20-8.1ubuntu0.24.04.1

5 vendors · 5 products

References

12 links
Show all 12 references