Is CVE-2020-21047 in the CISA KEV catalog?

No. CVE-2020-21047 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-21047?

CVE-2020-21047 has a CVSS v3 base score of 5.5 (MEDIUM).

What is the EPSS score for CVE-2020-21047?

CVE-2020-21047 has an EPSS score of 0.23% (13th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-21047?

Upgrade elfutils on debian 11 to 0.180-1 or later. Fixes are available for 5 affected products.

CVE & CISA-KEV Catalog

CVE-2020-21047

MEDIUM

5.5

CVSS v3

NVD

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.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

elfutilsDebian

Fixed in:0.180-1CVE-2020-21047

elfutilsUbuntu

Fixed in:0.158-0ubuntu5.3+esm1USN-6322-1

Fixed in:0.165-3ubuntu1.2+esm1USN-6322-1

Fixed in:0.170-0.4ubuntu0.1+esm1USN-6322-1

Fixed in:0.176-1.1ubuntu0.1USN-6322-1

libasm1Ubuntu

Fixed in:0.158-0ubuntu5.3+esm1USN-6322-1

Fixed in:0.165-3ubuntu1.2+esm1USN-6322-1

Fixed in:0.170-0.4ubuntu0.1+esm1USN-6322-1

Fixed in:0.176-1.1ubuntu0.1USN-6322-1

libdw1Ubuntu

Fixed in:0.158-0ubuntu5.3+esm1USN-6322-1

Fixed in:0.165-3ubuntu1.2+esm1USN-6322-1

Fixed in:0.170-0.4ubuntu0.1+esm1USN-6322-1

Fixed in:0.176-1.1ubuntu0.1USN-6322-1

libelf1Ubuntu

Fixed in:0.158-0ubuntu5.3+esm1USN-6322-1

Fixed in:0.165-3ubuntu1.2+esm1USN-6322-1

Fixed in:0.170-0.4ubuntu0.1+esm1USN-6322-1

Fixed in:0.176-1.1ubuntu0.1USN-6322-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.23%probability of exploitation in 30 days

13thpercentile

Low risk: more likely to be exploited than 13% of all known CVEs.

References

Issue Tracking1

sourceware.org

Other references2

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.