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CVE-2023-49558

17
FAUCET Score

CVE-2023-49558 is a denial-of-service vulnerability affecting YASM 1.3.0.86.g9def, specifically within the expand_mmac_params function in the nasm-pp.c component. This vulnerability has a CVSS score of 5.5 (Medium), indicating that a remote attacker can trigger the denial of service with low attack complexity, requiring user interaction, and resulting in high availability impact. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
1.3.0.86.g9defCPE matchmatch criteria
cpe:2.3:a:yasm_project:yasm:1.3.0.86.g9def:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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 Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.38%
Probability of exploitation in next 30 days
EPSS Percentile
30.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0038 is in the 37th percentile among its peer group of 5,760 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

github_advisoryvendor investigatingvia nvd_reference
View patch

Vendor Advisories (2)

microsoft2024-Jan/CVE-2023-49558Moderate

An issue in YASM 1.3.0.86.g9def allows a remote attacker to cause a denial of service via the expand_mmac_params function in the modules/preprocs/nasm/nasm-pp.c component.

Jan 9, 2024
redhatCVE-2023-49558

YASM: allows a remote attacker to cause a denial of service via the expand_mmac_params

Jan 3, 2024

References

github.com / yasm/yasm/issues/252
ExploitIssue TrackingVendor Advisory