What is the CVSS score of CVE-2023-49556?

CVE-2023-49556 has a CVSS 3.1 base score of 5.5 (Medium). CVSS vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.7%.

Which versions of Yasm are affected by CVE-2023-49556?

Organizations using Buffer Overflow vulnerability in YASM 1.3.0.86.g9def should be aware of moderate risk from CVE-2023-49556, a buffer overflow vulnerability rated CVSS 5.5.

Is there a public PoC exploit available for CVE-2023-49556?

Yes, a public proof-of-concept exploit is available for CVE-2023-49556. Prioritise patching immediately. EPSS: 0.7%.

How to fix or mitigate CVE-2023-49556?

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

Yasm CVE-2023-49556

MEDIUM

Classic Buffer Overflow (CWE-120)

2024-01-03 cve@mitre.org

Buffer Overflow Denial Of Service Yasm

5.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.5 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Local

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

Mar 28, 2026 - 19:33 vuln.today

PoC Detected

Jun 03, 2025 - 15:15 vuln.today

Public exploit code

CVE Published

Jan 03, 2024 - 00:15 nvd

MEDIUM 5.5

DescriptionCVE.org

Buffer Overflow vulnerability in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the expr_delete_term function in the libyasm/expr.c component.

AnalysisAI

Buffer Overflow vulnerability in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the expr_delete_term function in the libyasm/expr.c component. Rated medium severity (CVSS 5.5), this vulnerability is no authentication required, low attack complexity. Public exploit code available and no vendor patch available.

Technical ContextAI

This vulnerability is classified as Buffer Copy without Size Check (CWE-120), which allows attackers to overflow a buffer to corrupt adjacent memory. Buffer Overflow vulnerability in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the expr_delete_term function in the libyasm/expr.c component. Affected products include: Yasm Project Yasm.

RemediationAI

No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Always validate buffer sizes before copy operations. Use bounded functions (strncpy, snprintf). Enable compiler protections.