CVE-2021-20232: fedoraproject fedora Use After Free
CVSS: 9.8v3.1CriticalModified
AliasesALPINE-CVE-2021-20232UBUNTU-CVE-2021-20232DEBIAN-CVE-2021-20232CGA-9v3r-xm69-7xw6CGA-hc3g-m7cq-frh9
Published 12-03-2021Last modified 14-10-2026
Vulnerability summary
CVE-2021-20232 is a critical (CVSS 9.8) Use After Free vulnerability in fedoraproject fedora. EPSS estimates a 3.48% chance of exploitation in the next 30 days, higher than 88.9% of scored vulnerabilities.
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)EPSS score
3.48%
0%100%
Low · +0.04 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 6 · Related 7Timeline
- 12-03-2021PublishedVulnerability first disclosed.
- 14-10-2026Last modifiedVulnerability information updated.
Description
A flaw was found in gnutls. A use after free issue in client_send_params in lib/ext/pre_shared_key.c may lead to memory corruption and other potential consequences.
CVSS metrics
8 scores · 7 sources · 2 versionsCritical 9.8Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HSourcesAll 7 agree
- OSV · AlpineEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · WolfiEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · ChainguardEcosystem advisory · calculated9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- NVDNIST9.8CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
High 7.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:N/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
3.48%
Chance of exploitation in the next 30 days
Percentile
89%
Versus all other CVEs
30-day change
+0.04 pp
From 3.44% on 19-09-2026
19-09-202619-10-2026
EPSS score3.48%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Alpine1 product
- gnutls≥ 3.6.3, < 3.6.15-r1 | ≥ 3.6.3, < 3.7.1-r0
Chainguard1 product
- gnutlsAll versions (No fix recorded)
Debian1 product
- gnutls28< 3.7.1-1
Fedoraproject1 product
- fedoraEOL34
Gnu1 product
- gnutls≥ 3.6.3, < 3.7.1
Redhat1 product
Ubuntu1 product
- gnutls28< 3.6.13-2ubuntu1.6
Wolfi1 product
- gnutlsAll versions (No fix recorded)
8 vendors · 8 products
References
19 links- bugzilla.redhat.com/show_bug.cgi?id=1922275X Refsource MISCFIXIssue TrackingPatchThird Party Advisory
