---
id: CVE-2025-69419
title: Out of bounds write in PKCS12_get_friendlyname() UTF-8 conversion
summary: |-
  Issue summary: Calling PKCS12_get_friendlyname() function on a maliciously
  crafted PKCS#12 file with a BMPString (UTF-16BE) friendly name containing
  non-ASCII BMP code point can trigger a one byte write before the allocated
  buffer.

  Impa…
severity: high
cvss: 7.4
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N'
cvssSource: adp
cwe:
  - CWE-787
vendor: OpenSSL
product: OpenSSL
affected:
  - OpenSSL >= 3.6.0 < 3.6.1
  - OpenSSL >= 3.5.0 < 3.5.5
  - OpenSSL >= 3.4.0 < 3.4.4
  - OpenSSL >= 3.3.0 < 3.3.6
  - OpenSSL >= 3.0.0 < 3.0.19
  - OpenSSL >= 1.1.1 < 1.1.1ze
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-01-29T15:09:04.605559Z'
exploitAvailable: true
published: '2026-01-27'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:10:26.835Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2025-69419'
references:
  - url: 'https://openssl-library.org/news/secadv/20260127.txt'
    label: OpenSSL Advisory
  - url: >-
      https://github.com/openssl/openssl/commit/7e9cac9832e4705b91987c2474ed06a37a93cecb
    label: 3.6.1 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/ff628933755075446bca8307e8417c14d164b535
    label: 3.5.5 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/cda12de3bc0e333ea8d2c6fd15001dbdaf280015
    label: 3.4.4 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/a26a90d38edec3748566129d824e664b54bee2e2
    label: 3.3.6 git commit
  - url: >-
      https://github.com/openssl/openssl/commit/41be0f216404f14457bbf3b9cc488dba60b49296
    label: 3.0.19 git commit
tags:
  - cve.org
  - exploit-available
epss: 0.00616
epssPercentile: 0.48316
exploits:
  github: 1
  githubRepos:
    - 'https://github.com/Kha-Beleh/PoC-CVE-2025-69419'
  checkedAt: '2026-10-15T05:53:20.621Z'
ingestedAt: '2026-10-15T05:52:46.061Z'
---

## Overview

Issue summary: Calling PKCS12_get_friendlyname() function on a maliciously
crafted PKCS#12 file with a BMPString (UTF-16BE) friendly name containing
non-ASCII BMP code point can trigger a one byte write before the allocated
buffer.

Impact summary: The out-of-bounds write can cause a memory corruption
which can have various consequences including a Denial of Service.

The OPENSSL_uni2utf8() function performs a two-pass conversion of a PKCS#12
BMPString (UTF-16BE) to UTF-8. In the second pass, when emitting UTF-8 bytes,
the helper function bmp_to_utf8() incorrectly forwards the remaining UTF-16
source byte count as the destination buffer capacity to UTF8_putc(). For BMP
code points above U+07FF, UTF-8 requires three bytes, but the forwarded
capacity can be just two bytes. UTF8_putc() then returns -1, and this negative
value is added to the output length without validation, causing the
length to become negative. The subsequent trailing NUL byte is then written
at a negative offset, causing write outside of heap allocated buffer.

The vulnerability is reachable via the public PKCS12_get_friendlyname() API
when parsing attacker-controlled PKCS#12 files. While PKCS12_parse() uses a
different code path that avoids this issue, PKCS12_get_friendlyname() directly
invokes the vulnerable function. Exploitation requires an attacker to provide
a malicious PKCS#12 file to be parsed by the application and the attacker
can just trigger a one zero byte write before the allocated buffer.
For that reason the issue was assessed as Low severity according to our
Security Policy.

The FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,
as the PKCS#12 implementation is outside the OpenSSL FIPS module boundary.

OpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.

OpenSSL 1.0.2 is not affected by this issue.

## Affected

- `OpenSSL >= 3.6.0 < 3.6.1`
- `OpenSSL >= 3.5.0 < 3.5.5`
- `OpenSSL >= 3.4.0 < 3.4.4`
- `OpenSSL >= 3.3.0 < 3.3.6`
- `OpenSSL >= 3.0.0 < 3.0.19`
- `OpenSSL >= 1.1.1 < 1.1.1ze`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.