CVE-2021-20251: fedoraproject fedora Race Condition
CVSS: 5.9v3.1MediumModified
AliasesUBUNTU-CVE-2021-20251DEBIAN-CVE-2021-20251openSUSE-SU-2024:12435-1
Published 06-03-2023Last modified 06-03-2025
Vulnerability summary
CVE-2021-20251 is a medium (CVSS 5.9) Race Condition vulnerability in fedoraproject fedora. EPSS estimates a 0.76% chance of exploitation in the next 30 days, higher than 54.3% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
5.9/10
010
Medium · v3.1 (NVD)EPSS score
0.76%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Advisory lineage
Upstream 0 · Downstream 9 · Related 9Timeline
- 06-03-2023PublishedVulnerability first disclosed.
- 06-03-2025Last modifiedVulnerability information updated.
Description
A flaw was found in samba. A race condition in the password lockout code may lead to the risk of brute force attacks being successful if special conditions are met.
CVSS metrics
3 scores · 3 sources · 1 versionMedium 5.9Preferred score · NVD (NIST)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:NSourcesAll 3 agree
- OSV · UbuntuEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- OSV · DebianEcosystem advisory · calculated5.9MediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
EPSS trend
Probability
0.76%
Chance of exploitation in the next 30 days
Percentile
54%
Versus all other CVEs
30-day change
0.00 pp
From 0.76% on 18-09-2026
18-09-202618-10-2026
EPSS score0.76%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.samba.org)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- samba< 2:4.17.2+dfsg-3
Fedoraproject1 product
- fedoraEOL37
Opensuse1 product
- samba&distro=openSUSE Tumbleweed< 4.17.1+git.270.17afe7cb6b-1.1
Samba1 product
- samba≥ 4.1.0, < 4.16.8 | ≥ 4.17.0, < 4.17.4
Ubuntu1 product
- sambaAll versions (No fix recorded)
5 vendors · 5 products
References
11 links- security.netapp.com/advisory/ntap-20230331-0005/Third Party Advisory
- security.gentoo.org/glsa/202309-06Vendor Advisory
