There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2021-3405)

The remote host is affected by the vulnerability described in GLSA-202208-21 (libebml: Heap buffer overflow vulnerability)

  - 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. (CVE-2021-3405)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 33 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2021-aa78f97893 advisory.

  - 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. (CVE-2021-3405)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

A heap overflow issue was detected in libebml, a library to read and write files in the EBML format, a binary pendant to XML. These issues appeared in several ReadData functions of various data type classes.
This update also fixes the issue in EbmlString::ReadData and EbmlUnicodeString::ReadData, which were mentioned in CVE-2021-3405.

For Debian 9 stretch, this problem has been fixed in version 1.3.4-1+deb9u2.

We recommend that you upgrade your libebml packages.

For the detailed security status of libebml please refer to its security tracker page at:
https://security-tracker.debian.org/tracker/libebml

NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2021-3405)

Note that Nessus relies on the presence of the package as reported by the vendor.

The remote Fedora 32 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2021-9a0fff8455 advisory.

  - 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. (CVE-2021-3405)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Published	Updated	Severity
405152	Alpine: multiple libebml packages: security update to 1.4.2-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	medium
400273	Alpine: multiple libebml packages: security update to 1.4.1-r0 (deprecated)	Tenable Cloud Security	Alpine Linux Local Security Checks	8/16/2023	7/2/2026	medium
400273	Alpine: multiple libebml packages: security update to 1.4.1-r0 (deprecated)	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	8/16/2023	7/2/2026	medium
405152	Alpine: multiple libebml packages: security update to 1.4.2-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	10/31/2023	7/2/2026	medium
164118	GLSA-202208-21 : libebml: Heap buffer overflow vulnerability	Nessus	Gentoo Local Security Checks	8/15/2022	10/16/2023	medium
147519	Fedora 33 : libebml (2021-aa78f97893)	Nessus	Fedora Local Security Checks	3/10/2021	1/11/2024	medium
148762	Debian DLA-2629-1 : libebml security update	Nessus	Debian Local Security Checks	4/19/2021	1/12/2024	medium
259230	Linux Distros Unpatched Vulnerability : CVE-2021-3405	Nessus	Misc.	8/30/2025	9/9/2026	medium
147515	Fedora 32 : libebml (2021-9a0fff8455)	Nessus	Fedora Local Security Checks	3/10/2021	1/11/2024	medium

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