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CVE-2020-24978

28
FAUCET Score

CVE-2020-24978 is a critical double-free vulnerability (CWE-415) affecting NASM 2.15.04rc3, specifically within the pp_tokline function in asm/preproc.c. This flaw carries a CVSS score of 9.8, indicating a severe risk with potential for complete compromise (Confidentiality, Integrity, Availability) via a low-complexity network attack requiring no user interaction. While highly severe, there is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage. The vulnerability has been patched in commit 8806c3ca007b84accac21dd88b900fb03614ceb7.

Impacted Technologies

VendorProductVersion(s)CPE
2.15.04CPE matchmatch criteria
cpe:2.3:a:nasm:netwide_assembler:2.15.04:rc3:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.36%
Probability of exploitation in next 30 days
EPSS Percentile
68.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0136 is in the 55th percentile among its peer group of 36,835 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (2)

microsoft2020-Sep/CVE-2020-24978

In NASM 2.15.04rc3, there is a double-free vulnerability in pp_tokline asm/preproc.c. This is fixed in commit 8806c3ca007b84accac21dd88b900fb03614ceb7.

Sep 8, 2020
redhatCVE-2020-24978Low

nasm: double-free vulnerability in pp_tokline asm/preproc.c

Sep 4, 2020

References

bugzilla.nasm.us / show_bug.cgi
ExploitIssue TrackingVendor Advisory