# CVE-2021-46853: alpine: Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent...

CVE-2021-46853 is fixed in 3 products on 1 platform, first by alpine 2.21+dfsg1-1ubuntu0.1~esm1, released November 2, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-46853
- Priority: Routine
- CVSS: 5.9 (medium)
- EPSS: 0.0115
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Nov 2, 2022

## Description

Alpine before 2.25 allows remote attackers to cause a denial of service (application crash) when LIST or LSUB is sent before STARTTLS.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | alpine Debian 12.15 (bookworm) | 2.25+dfsg1-1 | [DEBIAN-CVE-2021-46853](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46853.md) | Nov 3, 2022 |
| Linux | alpine Debian 13.5 (trixie) | 2.25+dfsg1-1 | [DEBIAN-CVE-2021-46853](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46853.md) | Nov 3, 2022 |
| Linux | alpine Debian 14 | 2.25+dfsg1-1 | [DEBIAN-CVE-2021-46853](https://patchblox.com/security/data/fix/linux/debian-cve-2021-46853.md) | Nov 3, 2022 |
| Linux | alpine Ubuntu 18.04.6 LTS (bionic) | 2.21+dfsg1-1ubuntu0.1~esm1 | [alpine 2.21+dfsg1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-alpine-2.21-dfsg1-1ubuntu0.1-esm1.md) | Nov 2, 2022 |
| Linux | alpine Ubuntu 20.04 LTS (focal) | 2.22+dfsg1-1ubuntu0.1~esm1 | [alpine 2.22+dfsg1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-alpine-2.22-dfsg1-1ubuntu0.1-esm1.md) | Nov 2, 2022 |
| Linux | alpine-pico Ubuntu 18.04.6 LTS (bionic) | 2.21+dfsg1-1ubuntu0.1~esm1 | [alpine-pico 2.21+dfsg1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-alpine-pico-2.21-dfsg1-1ubuntu0.1-esm1.md) | Nov 2, 2022 |
| Linux | alpine-pico Ubuntu 20.04 LTS (focal) | 2.22+dfsg1-1ubuntu0.1~esm1 | [alpine-pico 2.22+dfsg1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-alpine-pico-2.22-dfsg1-1ubuntu0.1-esm1.md) | Nov 2, 2022 |
| Linux | pilot Ubuntu 18.04.6 LTS (bionic) | 2.21+dfsg1-1ubuntu0.1~esm1 | [pilot 2.21+dfsg1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-pilot-2.21-dfsg1-1ubuntu0.1-esm1.md) | Nov 2, 2022 |
| Linux | pilot Ubuntu 20.04 LTS (focal) | 2.22+dfsg1-1ubuntu0.1~esm1 | [pilot 2.22+dfsg1-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-pilot-2.22-dfsg1-1ubuntu0.1-esm1.md) | Nov 2, 2022 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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