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.

Affected

libebml

CVSS v3.1 NVD

6.5 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS v2.0 NVD

4.3 MEDIUMAV:N/AC:M/Au:N/C:N/I:N/A:P

EPSS

1.73% chance of exploitation in the next 30 days, 77th percentile

Published

2021-02-23

Updated

2024-08-03

Proof-of-concept exploits (1)

• Matroska-Org/libebml/issues/74165★ · 2026-09-20

Security advisories

• https://lists.debian.org/debian-lts-announce/2021/04/msg00016.html
• https://security.gentoo.org/glsa/202208-21

References

• CVE Record
• NVD entry

Related

• CVE-2017-12780
• CVE-2017-12781
• CVE-2017-12782
• CVE-2017-12783
• CVE-2017-12800
• CVE-2017-12801