CVE-2020-18974: nasm netwide_assembler Classic Buffer Overflow
CVSS: 4.3v2.0MediumModified
AliasesUBUNTU-CVE-2020-18974DEBIAN-CVE-2020-18974
Published 25-08-2021Last modified 04-08-2024
Vulnerability summary
CVE-2020-18974 is a medium (CVSS 4.3) Classic Buffer Overflow vulnerability in nasm netwide_assembler. EPSS estimates a 0.83% chance of exploitation in the next 30 days, higher than 56.8% of scored vulnerabilities. 1 public exploit is recorded.
CVSS score
4.3/10
010
Medium · v2.0 (NVD)EPSS score
0.83%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits1reference
Timeline
- 25-08-2021PublishedVulnerability first disclosed.
- 04-08-2024Last modifiedVulnerability information updated.
Description
Buffer Overflow in Netwide Assembler (NASM) v2.15.xx allows attackers to cause a denial of service via 'crc64i' in the component 'nasmlib/crc64'. This issue is different than CVE-2019-7147.
CVSS metrics
4 scores · 3 sources · 2 versionsLow 3.3Preferred score · OSV · Ubuntu (Ecosystem advisory) · calculated from vector
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:LSourcesAll 3 agree
- OSV · DebianEcosystem advisory · calculated3.3LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
- NVDNIST3.3LowCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Medium 4.3Preferred score · NVD (NIST)
AV:N/AC:M/Au:N/C:N/I:N/A:PSourcesSingle source
EPSS trend
Probability
0.83%
Chance of exploitation in the next 30 days
Percentile
57%
Versus all other CVEs
30-day change
0.00 pp
From 0.83% on 20-09-2026
20-09-202620-10-2026
EPSS score0.83%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
1 foundExploit Reference (bugzilla.nasm.us)
Maturity: unknown
Weaknesses
CWE · root causeAffected systems
Debian1 product
- nasmAll versions (No fix recorded)
Nasm1 product
- netwide_assembler≥ 2.15, ≤ 2.15.05
Ubuntu1 product
- nasmAll versions (No fix recorded)
3 vendors · 3 products
