5.5

CVE-2020-21047: elfutils_project elfutils Out-of-bounds Write

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2020-21047DEBIAN-CVE-2020-21047DLA-3579-1
Published 22-08-2023Last modified 14-10-2026
Open JSON

Vulnerability summary

CVE-2020-21047 is a medium (CVSS 5.5) Out-of-bounds Write vulnerability in elfutils_project elfutils. EPSS estimates a 0.25% chance of exploitation in the next 30 days, higher than 15.3% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.25%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
USN-6322-1

Timeline

  1. 22-08-2023
    PublishedVulnerability first disclosed.
  2. 14-10-2026
    Last modifiedVulnerability information updated.

Description

The libcpu component which is used by libasm of elfutils version 0.177 (git 47780c9e), suffers from denial-of-service vulnerability caused by application crashes due to out-of-bounds write (CWE-787), off-by-one error (CWE-193) and reachable assertion (CWE-617); to exploit the vulnerability, the attackers need to craft certain ELF files which bypass the missing bound checks.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.25%

Chance of exploitation in the next 30 days

Percentile

15%

Versus all other CVEs

30-day change

+0.01 pp

From 0.24% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.25%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • elfutils< 0.176-1.1+deb10u1 | < 0.180-1
Elfutils_project1 product
Ubuntu1 product
  • elfutils< 0.158-0ubuntu5.3+esm1 | < 0.165-3ubuntu1.2+esm1 | < 0.170-0.4ubuntu0.1+esm1 | < 0.176-1.1ubuntu0.1

3 vendors · 3 products

References

10 links