CVE-2022-25516Public exploitNetwork attack vector

Denial of service via stbtt__find_table overflow

Published Mar 17, 2022 · Updated Aug 3, 2024

Heap-based buffer overflow in stb_truetype.h v1.26 allows attackers to interrupt services via crafted font data. The stbtt__find_table function reads past the heap buffer while stbtt_InitFont parses malformed TrueType data, as demonstrated by AddressSanitizer. Exploitation requires a victim application to process the crafted font, and the published record disputes applicability because the library disclaims handling untrusted input; observed impact is a process abort or service interruption.

CVSS severity6.5
Medium
EPSS probability0.94%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap-based buffer overflow in stb_truetype.h v1.26 allows attackers to interrupt services via crafted font data. The stbtt__find_table function reads past the heap buffer while stbtt_InitFont parses malformed TrueType data, as demonstrated by AddressSanitizer. Exploitation requires a victim application to process the crafted font, and the published record disputes applicability because the library disclaims handling untrusted input; observed impact is a process abort or service interruption.

The record

CVE
CVE-2022-25516
Published
Mar 17, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 17, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 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 vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
6.5NVDCVSS:3.1/AV:N/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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
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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