CVE-2020-21528 json
A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a…
published 2023-08-22 3 y ago modified 2026-07-25 3 mo ago also EUVD-2020-14296 , JLSEC-2026-200
- cvss
- 5.5
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 45%
- public exploits
- 0
- none known
Summary
A Segmentation Fault issue discovered in in ieee_segment function in outieee.c in nasm 2.14.03 and 2.15 allows remote attackers to cause a denial of service via crafted assembly file.
Patch / fix
- julia NASM_jll 2.16.1+0
- nasm Debian 14, Debian 13, Debian 12 2.16.01-1
debian advisories DEBIAN-CVE-2020-21528
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2020-21528 updated cvss 5.5
nasm: segmentation fault in ieee_segment() in outieee.c
-
Red Hat Enterprise Linux 6 nasm, nasm-rdoff Red Hat Enterprise Linux 7 nasm, nasm-rdoffaffected: no fix planned “Out of support scope”
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
0.54% chance of exploitation in the next 30 days, higher than 45% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- bugzilla.nasm.us https://bugzilla.nasm.us/show_bug.cgi?id=3392637 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| OSV | 3.1 | 5.5 | CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| julia | NASM_jll | <2.16.1+0 |
2.16.1+0 |
References
-
bugzilla.nasm.us
/show_bug.cgi?id=3392637
exploit, issue-tracking, vendor-advisory, web
-
security.gentoo.org
/glsa/202312-09
vendor-advisory, web
Sources
- CVE List CVE-2020-21528
- NVD CVE-2020-21528
- OSV JLSEC-2026-200
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