Buffer overflow in Musl-Libc Musl
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).
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.007 (49.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
- Musl-Libc Musl
- Oracle Graalvm — versions 20.3.2, 21.1.0
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 33, 34
Weakness classification (CWE)
Public proof-of-concept exploits
- ARPSyndicate/cvemon
- Anna-Rafaella/Conteneurisation
- ChrisAdkin8/Nomad-Job-Vulnerability-Tagging
- SilveiraLeonardo/experimenting_
- arindam0310018/04-Apr-2022-DevOps__
- chaimleib/maclfs
- developer-guy/image-scanning-using-trivy-as-go-library
- fivexl/aws-ecr-client-golang
- fredrkl/trivy-demo
- henrymrrtt67/Sample.WeatherForecast
References
- musl.libc.org/releases.html (Release Notes, Vendor Advisory)
- lists.debian.org/debian-lts-announce/2020/11/msg00050.html (mailing-list, Mailing List, Third Party Advisory)
- lists.apache.org/thread.html/ra63e8dc5137d952afc55dbbfa63be83304ecf842d1eab1ff3… (mailing-list)
- lists.apache.org/thread.html/r90b60cf49348e515257b4950900c1bd3ab95a960cf2469d91… (mailing-list)
- lists.apache.org/thread.html/r2134abfe847bea7795f0e53756d10a47e6643f35ab8169df8… (mailing-list)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- www.oracle.com//security-alerts/cpujul2021.html (Patch, Third Party Advisory)
- www.openwall.com/lists/oss-security/2020/11/20/4 (Mailing List, Third Party Advisory)
- www.oracle.com/security-alerts/cpuoct2021.html (Patch, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-28928?
- CVE-2020-28928 is a medium-severity vulnerability in Musl-Libc Musl, classified under Out-of-bounds Write. CVSS score: 5.5/10. Published 2020-11-24.
- How severe is CVE-2020-28928?
- Medium severity. CVSS v3 base score is 5.5 out of 10.
- Is CVE-2020-28928 known to be exploited?
- 18 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.