CVE-2025-69419 (GCVE-0-2025-69419)

Vulnerability from cvelistv5 – Published: 2026-01-27 16:01 – Updated: 2026-01-29 15:09
VLAI?
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. 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.
Severity ?
No CVSS data available.
CWE
Assigner
References
Impacted products
Vendor Product Version
OpenSSL OpenSSL Affected: 3.6.0 , < 3.6.1 (semver)
Affected: 3.5.0 , < 3.5.5 (semver)
Affected: 3.4.0 , < 3.4.4 (semver)
Affected: 3.3.0 , < 3.3.6 (semver)
Affected: 3.0.0 , < 3.0.19 (semver)
Affected: 1.1.1 , < 1.1.1ze (custom)
Create a notification for this product.
Credits
Stanislav Fort (Aisle Research) Norbert Pócs
Show details on NVD website
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In the second pass, when emitting UTF-8 bytes,\u003cbr\u003ethe helper function bmp_to_utf8() incorrectly forwards the remaining UTF-16\u003cbr\u003esource byte count as the destination buffer capacity to UTF8_putc(). For BMP\u003cbr\u003ecode points above U+07FF, UTF-8 requires three bytes, but the forwarded\u003cbr\u003ecapacity can be just two bytes. UTF8_putc() then returns -1, and this negative\u003cbr\u003evalue is added to the output length without validation, causing the\u003cbr\u003elength to become negative. The subsequent trailing NUL byte is then written\u003cbr\u003eat a negative offset, causing write outside of heap allocated buffer.\u003cbr\u003e\u003cbr\u003eThe vulnerability is reachable via the public PKCS12_get_friendlyname() API\u003cbr\u003ewhen parsing attacker-controlled PKCS#12 files. While PKCS12_parse() uses a\u003cbr\u003edifferent code path that avoids this issue, PKCS12_get_friendlyname() directly\u003cbr\u003einvokes the vulnerable function. Exploitation requires an attacker to provide\u003cbr\u003ea malicious PKCS#12 file to be parsed by the application and the attacker\u003cbr\u003ecan just trigger a one zero byte write before the allocated buffer.\u003cbr\u003eFor that reason the issue was assessed as Low severity according to our\u003cbr\u003eSecurity Policy.\u003cbr\u003e\u003cbr\u003eThe FIPS modules in 3.6, 3.5, 3.4, 3.3 and 3.0 are not affected by this issue,\u003cbr\u003eas the PKCS#12 implementation is outside the OpenSSL FIPS module boundary.\u003cbr\u003e\u003cbr\u003eOpenSSL 3.6, 3.5, 3.4, 3.3, 3.0 and 1.1.1 are vulnerable to this issue.\u003cbr\u003e\u003cbr\u003eOpenSSL 1.0.2 is not affected by this issue.\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-787\", \"description\": \"CWE-787 Out-of-bounds Write\"}]}], \"providerMetadata\": {\"orgId\": \"3a12439a-ef3a-4c79-92e6-6081a721f1e5\", \"shortName\": \"openssl\", \"dateUpdated\": \"2026-01-27T16:01:24.822Z\"}}}",
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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.