---
id: CVE-2020-29362
title: An issue was discovered in p11-kit 0.21.1 through 0.23.21
summary: >-
  An issue was discovered in p11-kit 0.21.1 through 0.23.21. A heap-based buffer
  over-read has been discovered in the RPC protocol used by thep11-kit
  server/remote commands and the client library. When the remote entity supplies
  a byte arr…
severity: medium
cvss: 5.3
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N'
cwe:
  - CWE-125
vendor: p11-kit_project
product: p11-kit
affected:
  - 'p11-kit >= 0.23.6, < 0.23.22'
patched:
  - p11-kit 0.23.22
published: '2020-12-16'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T10:17:34.647'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2020-29362'
references:
  - url: 'https://github.com/p11-glue/p11-kit/releases'
    label: cve@mitre.org
  - url: >-
      https://github.com/p11-glue/p11-kit/security/advisories/GHSA-5wpq-43j2-6qwc
    label: cve@mitre.org
  - url: 'https://lists.debian.org/debian-lts-announce/2021/01/msg00002.html'
    label: cve@mitre.org
  - url: 'https://www.debian.org/security/2021/dsa-4822'
    label: cve@mitre.org
  - url: 'https://github.com/p11-glue/p11-kit/releases'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://github.com/p11-glue/p11-kit/security/advisories/GHSA-5wpq-43j2-6qwc
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2021/01/msg00002.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://www.debian.org/security/2021/dsa-4822'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.0227
epssPercentile: 0.82964
ingestedAt: '2026-10-14T10:25:41.183Z'
---

## Overview

An issue was discovered in p11-kit 0.21.1 through 0.23.21. A heap-based buffer over-read has been discovered in the RPC protocol used by thep11-kit server/remote commands and the client library. When the remote entity supplies a byte array through a serialized PKCS#11 function call, the receiving entity may allow the reading of up to 4 bytes of memory past the heap allocation.

## Affected

- `p11-kit >= 0.23.6, < 0.23.22`

## Remediation

Upgrade past the affected range:

- `p11-kit 0.23.22`