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Vulnerability · Published Feb 23, 2021 · Assigned by redhat

CVE-2021-3405

Medium 6.5

In plain English

A medium-severity out-of-bounds write in libebml. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.7% (higher than 78% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS NVD)6.5Medium
Exploit odds (30 days)1.7%top 22.3% of all CVEs
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known

Official description

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 packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20libebml1.4.2-r0ALPINE-CVE-2021-3405
Alpine:v3.21libebml1.4.2-r0ALPINE-CVE-2021-3405
Alpine:v3.22libebml1.4.2-r0ALPINE-CVE-2021-3405
Alpine:v3.23libebml1.4.2-r0ALPINE-CVE-2021-3405
Alpine:v3.24libebml1.4.2-r0ALPINE-CVE-2021-3405
Debian:12libebml1.4.2-1DEBIAN-CVE-2021-3405
Debian:13libebml1.4.2-1DEBIAN-CVE-2021-3405
Debian:14libebml1.4.2-1DEBIAN-CVE-2021-3405
Ubuntu:25.10libebmlno fix listedUBUNTU-CVE-2021-3405

Affected products (as reported)

VendorProductVersions
n/a libebml before 1.4.2

Weakness: CWE-787

References