CVE-2021-3756

Heap-based Buffer Overflow in hoene/libmysofa

6.2 MediumFix available

libmysofa is vulnerable to Heap-based Buffer Overflow

Attack profile

How easy it is to exploit

Attack vector: Local
Complexity: High
Privileges needed: None
User interaction: None

What an attacker can affect

Confidentiality: Low
Integrity: Low
Availability: High

Exploit likelihood

1.07%Up 0.4 points since Oct 30, 2021

What each source reports

CVE List Score used 6.2

Heap-based Buffer Overflow in hoene/libmysofa

libmysofa is vulnerable to Heap-based Buffer Overflow

Record: CVE-2021-3756
CVSS 3.0: 6.2 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Weakness: CWE-122
Updated: 2026-11-02

EUVDEUVD-2021-27030 6.2

libmysofa is vulnerable to Heap-based Buffer Overflow

Record: EUVD-2021-27030
CVSS 3.0: 6.2 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Updated: 2026-11-03

GitHub AdvisoriesGHSA-ph84-4hmc-hhqm No score

libmysofa is vulnerable to Heap-based Buffer Overflow

libmysofa is vulnerable to Heap-based Buffer Overflow

Record: GHSA-ph84-4hmc-hhqm
Weakness: CWE-122, CWE-787
Updated: 2026-11-02

NVD 9.8

libmysofa is vulnerable to Heap-based Buffer Overflow

Record: CVE-2021-3756
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0: 6.2 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
CVSS 2.0: 7.5 HighAV:N/AC:L/Au:N/C:P/I:P/A:P
Weakness: CWE-122, CWE-787
Updated: 2026-11-02

OSV 9.8

libmysofa is vulnerable to Heap-based Buffer Overflow

Record: CVE-2021-3756
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

OSVDEBIAN-CVE-2021-3756 9.8

libmysofa is vulnerable to Heap-based Buffer Overflow

Record: DEBIAN-CVE-2021-3756
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated: 2026-11-02

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OSVUBUNTU-CVE-2021-3756 9.8

libmysofa is vulnerable to Heap-based Buffer Overflow

Record: UBUNTU-CVE-2021-3756
CVSS 3.1: 9.8 CriticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS 3.0: 6.2 MediumCVSS:3.0/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:H
Updated: 2026-11-02

OSVopenSUSE-SU-2024:11673-1 No score

libmysofa-devel-1.2.1-1.1 on GA media

These are all security issues fixed in the libmysofa-devel-1.2.1-1.1 package on the GA media of openSUSE Tumbleweed.

Record: openSUSE-SU-2024:11673-1
Updated: 2026-11-02

OSVROOT-OS-DEBIAN-11-CVE-2021-3756 No score

CVE-2021-3756 in libmysofa - Patched by Root

Root has patched CVE-2021-3756 in the libmysofa package for Root:Debian:11. Multiple fixed versions available.

Record: ROOT-OS-DEBIAN-11-CVE-2021-3756
Updated: 2026-11-02

OSVUSN-5184-1 No score

libmysofa vulnerability

It was discovered that libmysofa mishandled certain input. An attacker could use this vulnerability to cause a denial of service (crash).

Record: USN-5184-1
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`libmysofa` Debian:12	before 1.2.1~dfsg0-1	1.2.1~dfsg0-1
`libmysofa` Debian:13	before 1.2.1~dfsg0-1	1.2.1~dfsg0-1
`libmysofa` Debian:14	before 1.2.1~dfsg0-1	1.2.1~dfsg0-1
`libmysofa` Root:Debian:11	before 1.2~dfsg0-1.root.io.2	1.2~dfsg0-1.root.io.21.2~dfsg0-1.root.io.31.2~dfsg0-1.root.io.41.2~dfsg0-1.aikido.61.2~dfsg0-1.root.io.11.2~dfsg0-1.root.io.5
`rootio-libmysofa` Root:Debian:11	before 1.2~dfsg0-1.root.io.2	1.2~dfsg0-1.root.io.21.2~dfsg0-1.root.io.31.2~dfsg0-1.root.io.41.2~dfsg0-1.aikido.61.2~dfsg0-1.root.io.11.2~dfsg0-1.root.io.5
`libmysofa` Ubuntu:Pro:18.04:LTS	before 0.6~dfsg0-3+deb10u1ubuntu0.1~esm1, plus listed versions 0.6~dfsg0-10.6~dfsg0-20.6~dfsg0-2ubuntu0.18.04.10.6~dfsg0-3+deb10u1build1	0.6~dfsg0-3+deb10u1ubuntu0.1~esm1
`libmysofa` Ubuntu:Pro:20.04:LTS	before 1.0~dfsg0-1ubuntu0.1~esm1, plus listed versions 0.7~dfsg0-10.8~dfsg0-10.9~dfsg0-10.9.1~dfsg0-11.0~dfsg0-1	1.0~dfsg0-1ubuntu0.1~esm1
`libmysofa` Ubuntu:22.04:LTS	before 1.2.1~dfsg0-1, plus listed versions 1.2~dfsg0-1	1.2.1~dfsg0-1

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3756 is a medium vulnerability (CVSS 6.2) in Hoene Hoene/libmysofa, published October 29, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.07%, the 65th percentile. Fixed in libmysofa 1.2.1~dfsg0-1.

References

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