CVE-2021-36083

Application crash via unchecked XCF run length

Published Jul 1, 2021 · Updated Aug 4, 2024

Stack-based buffer overflow in KDE KImageFormats 5.70.0 through 5.81.0 allows local users to crash image-handling applications via a crafted XCF file. XCFImageFormat::loadTileRLE trusts an encoded repeat length while expanding tile channels and writes the repeated byte beyond the stack tile buffer. Exploitation requires an application using the plugin to process the malformed image; the published assessment limits the demonstrated consequence to a crash and reports no confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.95%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stack-based buffer overflow in KDE KImageFormats 5.70.0 through 5.81.0 allows local users to crash image-handling applications via a crafted XCF file. XCFImageFormat::loadTileRLE trusts an encoded repeat length while expanding tile channels and writes the repeated byte beyond the stack tile buffer. Exploitation requires an application using the plugin to process the malformed image; the published assessment limits the demonstrated consequence to a crash and reports no confidentiality or integrity impact.

The record

CVE
CVE-2021-36083
Published
Jul 1, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1499.004
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 1, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3NVDAV:N/AC:M/Au:N/C:N/I:N/A:P
5.5NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo