CVE-2021-21065

Code execution via embedded-font buffer overrun

Published Feb 25, 2021 · Updated Sep 17, 2024

Out-of-bounds write in the TTF parser in Adobe Bridge 11.0 and earlier allows attackers to execute code via a malicious file. The embedded-font parser fails to validate user-supplied TTF data before writing beyond the end of an allocated buffer. A user must open the crafted file, after which attacker-controlled code runs in the Bridge process with that user's privileges.

CVSS severity7.8
High
EPSS probability3.72%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds write in the TTF parser in Adobe Bridge 11.0 and earlier allows attackers to execute code via a malicious file. The embedded-font parser fails to validate user-supplied TTF data before writing beyond the end of an allocated buffer. A user must open the crafted file, after which attacker-controlled code runs in the Bridge process with that user's privileges.

The record

CVE
CVE-2021-21065
Published
Feb 25, 2021
Updated
Sep 17, 2024
Vendor
Adobe
Product
Adobe Bridge
Classifications
CWE-787, T1203, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Feb 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <=11.0
  2. Affected versionversion=unspecified <=None

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Adobe · Adobe Bridgeversion=unspecified <=11.0; version=unspecified <=None

Published CVSS scores

7.8AdobeCVSS:3.0/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1203Exploitation for Client Execution
T1204.002User Execution: Malicious 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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