Is CVE-2020-21597 in the CISA KEV catalog?

No. CVE-2020-21597 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2020-21597?

CVE-2020-21597 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2020-21597?

CVE-2020-21597 has an EPSS score of 1.44% (70th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2020-21597?

Upgrade libde265 on debian 11 to 1.0.11-0+deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2020-21597

MEDIUM

6.5

CVSS v3

NVD

Description

libde265 v1.0.4 contains a heap buffer overflow in the mc_chroma function, which can be exploited via a crafted a file.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

libde265Debian

Fixed in:1.0.11-0+deb11u1CVE-2020-21597

Fixed in:1.0.9-1CVE-2020-21597

libde265Ubuntu

Fixed in:1.0.2-2ubuntu0.16.04.1~esm1USN-6617-1

Fixed in:1.0.2-2ubuntu0.18.04.1~esm1USN-6617-1

Fixed in:1.0.4-1ubuntu0.1USN-6617-1

libde265-0Ubuntu

Fixed in:1.0.2-2ubuntu0.16.04.1~esm1USN-6617-1

Fixed in:1.0.2-2ubuntu0.18.04.1~esm1USN-6617-1

Fixed in:1.0.4-1ubuntu0.1USN-6617-1

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 VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

1.44%probability of exploitation in 30 days

70thpercentile

Moderate risk: more likely to be exploited than 70% of all known CVEs.

References

Exploit1

github.com

Third-Party Advisory2

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.