Buffer overflow in Matroska Libebml
CVE-2021-3405
A flaw was found in libebml before 1.4.2. A heap overflow bug exists in the implementation of EbmlString::ReadData and EbmlUnicodeString::ReadData in libebml.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.017 (76.8th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 76.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.017 · newest: 0.017 · change: 0.000
Affected products
- Matroska Libebml
- Debian Linux — versions 9.0
- Fedoraproject Fedora — versions 32, 33, 34
- Libebml — versions before 1.4.2
Weakness classification (CWE)
References
- github.com/Matroska-Org/libebml/issues/74 (Exploit, Third Party Advisory, Issue Tracking)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory)
- lists.debian.org/debian-lts-announce/2021/04/msg00016.html (mailing-list, Third Party Advisory)
- security.gentoo.org/glsa/202208-21 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-3405?
- CVE-2021-3405 is a medium-severity vulnerability in Matroska Libebml, classified under Out-of-bounds Write. CVSS score: 6.5/10. Published 2021-02-23.
- How severe is CVE-2021-3405?
- Medium severity. CVSS v3 base score is 6.5 out of 10.