CVE-2022-35021Network attack vector

Utility crash via out-of-bounds Unicode conversion read

Published Sep 22, 2022 · Updated May 27, 2025

A global buffer overflow in OTFCC otfccdump commit 617837b allows remote attackers to crash the utility via a crafted OpenType font. Unicode conversion code reads 95 bytes immediately beyond an empty global string literal while otfccdump parses the malformed font. Exploitation requires a user or dependent workflow to process the file; public evidence demonstrates an AddressSanitizer-detected abort, not code execution.

CVSS severity6.5
Medium
EPSS probability0.81%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A global buffer overflow in OTFCC otfccdump commit 617837b allows remote attackers to crash the utility via a crafted OpenType font. Unicode conversion code reads 95 bytes immediately beyond an empty global string literal while otfccdump parses the malformed font. Exploitation requires a user or dependent workflow to process the file; public evidence demonstrates an AddressSanitizer-detected abort, not code execution.

The record

CVE
CVE-2022-35021
Published
Sep 22, 2022
Updated
May 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 22, 2022CVE publishedPublication date reported by the CVE source.
  2. May 27, 2025Record 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

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
6.5CISA ADP VulnrichmentCVSS: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1204.002Malicious File

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

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Your stack

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