CVE-2024-22920Public exploit

Crash via stale buffer pointer after realloc

Published Jan 19, 2024 · Updated Sep 11, 2024

Use-after-free in SWFTools 0.9.2 allows context-dependent attackers to crash swfc via crafted ActionScript source. In bufferWriteData, bufferCheckSize reallocates the output buffer, but execution then reads through the stale pre-reallocation data pointer. Exploitation requires a user or local workflow to pass the crafted file to swfc; the published proof demonstrates a sanitizer-detected abort, while code execution remains unestablished.

CVSS severity7.8
High
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in SWFTools 0.9.2 allows context-dependent attackers to crash swfc via crafted ActionScript source. In bufferWriteData, bufferCheckSize reallocates the output buffer, but execution then reads through the stale pre-reallocation data pointer. Exploitation requires a user or local workflow to pass the crafted file to swfc; the published proof demonstrates a sanitizer-detected abort, while code execution remains unestablished.

The record

CVE
CVE-2024-22920
Published
Jan 19, 2024
Updated
Sep 11, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-416, T1203
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jan 19, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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 privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:N/UI:R/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.

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

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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-416Use After Free
T1203Exploitation for Client Execution

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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