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CVE-2020-21600

23
FAUCET Score

CVE-2020-21600 describes a heap buffer overflow vulnerability in libde265 v1.0.4, specifically within the put_weighted_pred_avg_16_fallback function, which can be triggered by a specially crafted file. This vulnerability carries a CVSS score of 6.5 (Medium), indicating it can be exploited remotely with low attack complexity, requiring user interaction, and potentially leading to high availability impact. While no public exploit intelligence (Metasploit, Nuclei, ExploitDB) or active exploitation (KEV) has been identified, and community discussion and media coverage are minimal, the vulnerability remains a potential risk for systems utilizing the affected libde265 version.

Impacted Technologies

VendorProductVersion(s)CPE
1.0.4CPE matchmatch criteria
cpe:2.3:a:struktur:libde265:1.0.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.44%
Probability of exploitation in next 30 days
EPSS Percentile
70.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0144 is in the 83rd percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cwe.mitre.org / data/definitions/122.html
Technical Description
github.com / strukturag/libde265/issues/243
ExploitIssue TrackingThird Party Advisory
debian.org / security/2023/dsa-5346