PT-2021-21716 · Libmysofa+4 · Libmysofa+4

Published 2021-09-27 · Updated 2025-09-16 · CVE-2021-3756

Positive Technologies (AI Summary)

CVSS v3.1

9.8

Critical

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions libmysofa (affected versions not specified)

Description The issue is related to a Heap-based Buffer Overflow. There is no information provided about the estimated number of potentially affected devices worldwide or real-world incidents where this issue was exploited.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Heap Based Buffer Overflow

Memory Corruption

Weakness Enumeration

CWE-122

CWE-787

Related Identifiers

BDU:2025-12494

CVE-2021-3756

OPENSUSE-SU-2024:11673-1

ROSA-SA-2023-2256

USN-5184-1

Affected Products

Astra Linux

Debian

Linuxmint

Ubuntu

Libmysofa

References · 19

• 🔥 https://huntr.dev/bounties/7ca8d9ea-e2a6-4294-af28-70260bb53bc1 · Exploit
• https://github.com/hoene/libmysofa/commit/890400ebd092c574707d0c132124f8ff047e20e1 · Patch
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/PGQ45S4RH7MC42NHTAGOIHYR4C5IRTMZ · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-3756 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-3756 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-3756 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2025-0923SE17 · Vendor Advisory
• https://wiki.astralinux.ru/astra-linux-se47-bulletin-2025-1020SE47 · Vendor Advisory
• https://ubuntu.com/security/notices/USN-5184-1 · Vendor Advisory
• https://osv.dev/vulnerability/USN-5184-1 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2021-3756 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-3756 · Security Note
• https://osv.dev/vulnerability/CVE-2021-3756 · Vendor Advisory
• https://bdu.fstec.ru/vul/2025-12494 · Security Note
• https://cve.org/CVERecord?id=CVE-2021-3756 · Security Note