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No exploitation reportedFix available

CVE-2020-28928

No exploitation reported by the sources we read.

  • Published2020-11-24
  • WeaknessCWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

In musl libc through 1.2.1, wcsnrtombs mishandles particular combinations of destination buffer size and source character limit, as demonstrated by an invalid write access (buffer overflow).

Timeline

dates in UTC
  1. 2020-11-2418:15CVE publishedNVD

Versions per branch

NVD
Fedoraproject fedora
BranchAffectedFixed in
33.x= 33no fix published
34.x= 34no fix published
Oracle graalvm
BranchAffectedFixed in
20.3= 20.3.2no fix published
21.1= 21.1.0no fix published
Debian debian linux
BranchAffectedFixed in
9.0= 9.0no fix published

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • muslUbuntu:Pro:20.04:LTSall versions · fixed in 1.1.24-1ubuntu0.1~esm1
  • muslUbuntu:Pro:18.04:LTSall versions · fixed in 1.1.19-1ubuntu0.1~esm1
  • muslUbuntu:Pro:16.04:LTSall versions · fixed in 1.1.9-1ubuntu0.1~esm3
  • muslUbuntu:Pro:14.04:LTSall versions · fixed in 0.9.15-1ubuntu0.1~esm2
  • muslDebian:14all versions · fixed in 1.2.2-1
  • muslDebian:13all versions · fixed in 1.2.2-1
  • muslDebian:12all versions · fixed in 1.2.2-1
  • muslDebian:9all versions · fixed in 1.1.16-3+deb9u1

17 more package ranges on OSV.dev

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.15.5read 2026-10-23
  • NVDCVSS 2.02.1read 2026-10-23
  • NVDweakness (CWE)CWE-787read 2026-10-23
  • FIRST EPSSEPSS score0.7 %2026-11-05
  • OSVaffected packages—

Identifiers

  • EUVD-2020-21316same flawENISA EUVD · LicenseRef-ENISA-legal-notice
  • DLA-2474-1advisory covering several CVEsDebian · LicenseRef-unstated
  • USN-5990-1advisory covering several CVEsUbuntu

Technical details

CVSS v3 Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Published
2020-11-24
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-28928?

In musl libc through 1.2.1, wcsnrtombs mishandles particular combinations of destination buffer size and source character limit, as demonstrated by an invalid write access (buffer overflow).

Is CVE-2020-28928 actively exploited?

Active exploitation of CVE-2020-28928 has not been confirmed. Its EPSS score was 0.7% on 2026-11-05, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-28928?

CVE-2020-28928 has a CVSS v3 base score of 5.5 (MEDIUM severity), with vector string CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

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