CVE-2021-43086Public exploit

Encoder crash via out-of-bounds stack read

Published Feb 28, 2022 · Updated Aug 4, 2024

Stack buffer overflow in Arm astcenc 3.2.0 allows attackers to crash the encoder by compressing a crafted image with -cl. During symbolic block conversion, encode_ise reads one byte past the 32-byte values_to_encode stack array while encoding the image. The attacker must supply an image that an operator or consuming application compresses with the linear LDR mode; the demonstrated consequence is a segmentation fault.

CVSS severity9.8
Critical
EPSS probability1.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in Arm astcenc 3.2.0 allows attackers to crash the encoder by compressing a crafted image with -cl. During symbolic block conversion, encode_ise reads one byte past the 32-byte values_to_encode stack array while encoding the image. The attacker must supply an image that an operator or consuming application compresses with the linear LDR mode; the demonstrated consequence is a segmentation fault.

The record

CVE
CVE-2021-43086
Published
Feb 28, 2022
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Feb 28, 2022CVE 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

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write

Public exploit references

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

Technologies

Your stack

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Your stack

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