# CVE-2021-20308: htmldoc: Integer overflow in the htmldoc 1.9.11 and before may allow attackers to execute arbitrary code and cause a denial of...

CVE-2021-20308 is fixed in 2 products on 1 platform, first by htmldoc 1.9.2-1ubuntu0.2+esm1, released July 18, 2023. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-20308
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0248
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 5, 2021

## Description

Integer overflow in the htmldoc 1.9.11 and before may allow attackers to execute arbitrary code and cause a denial of service that is similar to CVE-2017-9181.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | htmldoc Ubuntu 18.04.6 LTS (bionic) | 1.9.2-1ubuntu0.2+esm1 | [htmldoc 1.9.2-1ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-htmldoc-1.9.2-1ubuntu0.2-esm1.md) | Jul 18, 2023 |
| Linux | htmldoc Ubuntu 20.04 LTS (focal) | 1.9.7-1ubuntu0.3+esm1 | [htmldoc 1.9.7-1ubuntu0.3+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-htmldoc-1.9.7-1ubuntu0.3-esm1.md) | Jul 18, 2023 |
| Linux | htmldoc-common Ubuntu 18.04.6 LTS (bionic) | 1.9.2-1ubuntu0.2+esm1 | [htmldoc-common 1.9.2-1ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-htmldoc-common-1.9.2-1ubuntu0.2-esm1.md) | Jul 18, 2023 |
| Linux | htmldoc-common Ubuntu 20.04 LTS (focal) | 1.9.7-1ubuntu0.3+esm1 | [htmldoc-common 1.9.7-1ubuntu0.3+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-htmldoc-common-1.9.7-1ubuntu0.3-esm1.md) | Jul 18, 2023 |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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