CVE-2019-20334: nasm netwide_assembler Uncontrolled Recursion
Vulnerability summary
CVE-2019-20334 is a medium (CVSS 5.5) Uncontrolled Recursion vulnerability in nasm netwide_assembler. EPSS estimates a 0.76% chance of exploitation in the next 30 days, higher than 54.5% of scored vulnerabilities. 2 public exploits are recorded.
Timeline
- 04-01-2020PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
In Netwide Assembler (NASM) 2.14.02, stack consumption occurs in expr# functions in asm/eval.c. This potentially affects the relationships among expr0, expr1, expr2, expr3, expr4, expr5, and expr6 (and stdscan in asm/stdscan.c). This is similar to CVE-2019-6290 and CVE-2019-6291.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.76%
Chance of exploitation in the next 30 days
Percentile
55%
Versus all other CVEs
30-day change
0.00 pp
From 0.76% on 20-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
2 foundExploit Reference (bugzilla.nasm.us)
Maturity: unknown
Exploit Reference (bugzilla.nasm.us)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- nasmAll versions (No fix recorded)
Nasm1 product
- netwide_assembler2.14.02
Ubuntu1 product
- nasmAll versions (No fix recorded)
3 vendors · 3 products
