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NVD / CVE Program· CNA mitre

CVE-2020-21598: libde265 v1.0.4 contains a heap buffer overflow in the ff_hevc_put_unweighted_pred_8_sse function, which can be exploited via a crafted a…

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 36/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.8% (FIRST EPSS); higher than 78.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: libde265 (Alpine:v3.14) 1.0.11-r0; libde265 (Debian:10) 1.0.3-1+deb10u1, 1.0.3-1+deb10u3; libde265 (Debian:11) 1.0.11-0+deb11u1.

Low priority for now. Upgrade to libde265 (Alpine:v3.14) 1.0.11-r0; libde265 (Debian:10) 1.0.3-1+deb10u1, 1.0.3-1+deb10u3; libde265 (Debian:11) 1.0.11-0+deb11u1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

libde265 v1.0.4 contains a heap buffer overflow in the ff_hevc_put_unweighted_pred_8_sse function, which can be exploited via a crafted a file.

Published
Sep 16, 2021
Updated
Jun 16, 2026
EPSS
1.8% · 78th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 1.8%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
strukturlibde265
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux11.0
  • struktur libde2651.0.4

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.14libde265before 1.0.11-r01.0.11-r0
Debian:10libde265before 1.0.3-1+deb10u11.0.3-1+deb10u1
Debian:10libde265before 1.0.3-1+deb10u31.0.3-1+deb10u3
Debian:11libde265before 1.0.11-0+deb11u11.0.11-0+deb11u1
Debian:12libde265before 1.0.9-11.0.9-1

Same product

struktur: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-1253Heap-based Buffer Overflow in strukturag/libde265
    40Plan
  • CVE-2023-49468Libde265 v1.0.14 was discovered to contain a global buffer overflow vulnerability in the read_coding_unit function at slice.cc.
    35Monitor
  • CVE-2023-49467Libde265 v1.0.14 was discovered to contain a heap-buffer-overflow vulnerability in the derive_combined_bipredictive_merging_candidates…
    35Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2020-21596Sep 16, 2021 · libde265 v1.0.4 contains a global buffer overflow in the decode_CABAC_bit function, which can be exploited via a crafted a file.
    26Monitor
  • ← EarlierCVE-2020-21597Sep 16, 2021 · libde265 v1.0.4 contains a heap buffer overflow in the mc_chroma function, which can be exploited via a crafted a file.
    26Monitor
  • Later →CVE-2020-21599Sep 16, 2021 · libde265 v1.0.4 contains a heap buffer overflow in the de265_image::available_zscan function, which can be exploited via a crafted a file.
    26Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:libde2651.0.11-r0 · Alpine:v3.14Package registry (OSV)
debian:libde2651.0.9-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Show all references (2 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records