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CVE-2020-21606

22
FAUCET Score

CVE-2020-21606 is a heap buffer overflow vulnerability in libde265 v1.0.4, specifically within the put_epel_16_fallback function, which can be triggered by processing a specially crafted file. This medium-severity vulnerability (CVSS 6.5) requires user interaction (UI:R) and network access (AV:N) to exploit, leading to a high impact on availability (A:H) but no impact on confidentiality or integrity. There is currently no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

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
1.10%
Probability of exploitation in next 30 days
EPSS Percentile
62.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0110 is in the 75th 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

github.com / strukturag/libde265/issues/232
ExploitIssue TrackingThird Party Advisory
debian.org / security/2023/dsa-5346