# CVE-2021-44847: libtoxcore2: A stack-based buffer overflow in handle_request function in DHT.c intoxcore 0.1.9 through 0.1.11 and 0.2.0 through 0....

CVE-2021-44847 is fixed in 3 products on 1 platform, first by libtoxcore2 0.2.13-1, released December 12, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-44847
- Priority: High
- CVSS: 9.8 (Medium)
- EPSS: 0.0414
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 12, 2021

## Description

A stack-based buffer overflow in handle_request function in DHT.c intoxcore 0.1.9 through 0.1.11 and 0.2.0 through 0.2.12 (caused by animproper length calculation during the handling of received networkpackets) allows remote attackers to crash the process or potentiallyexecute arbitrary code via a network packet.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libtoxcore Debian 12.15 (bookworm) | 0.2.13-1 | [DEBIAN-CVE-2021-44847](https://patchblox.com/security/data/fix/linux/debian-cve-2021-44847.md) | Dec 13, 2021 |
| Linux | libtoxcore Debian 13.5 (trixie) | 0.2.13-1 | [DEBIAN-CVE-2021-44847](https://patchblox.com/security/data/fix/linux/debian-cve-2021-44847.md) | Dec 13, 2021 |
| Linux | libtoxcore Debian 14 | 0.2.13-1 | [DEBIAN-CVE-2021-44847](https://patchblox.com/security/data/fix/linux/debian-cve-2021-44847.md) | Dec 13, 2021 |
| Linux | libtoxcore2 Ubuntu 22.04.1 LTS (jammy) | 0.2.13-1 | [libtoxcore2 0.2.13-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libtoxcore2-0.2.13-1.md) | Dec 12, 2021 |
| Linux | libtoxcore2 Ubuntu 24.10 (oracular) | 0.2.13-1 | [libtoxcore2 0.2.13-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libtoxcore2-0.2.13-1.md) | Jan 16, 2026 |
| Linux | libtoxcore2 Ubuntu 25.04 (plucky) | 0.2.13-1 | [libtoxcore2 0.2.13-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libtoxcore2-0.2.13-1.md) | Jan 16, 2026 |
| Linux | toxcore-utils Ubuntu 22.04.1 LTS (jammy) | 0.2.13-1 | [toxcore-utils 0.2.13-1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-toxcore-utils-0.2.13-1.md) | Dec 12, 2021 |
| Linux | toxcore-utils Ubuntu 24.10 (oracular) | 0.2.13-1 | [toxcore-utils 0.2.13-1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-toxcore-utils-0.2.13-1.md) | Jan 16, 2026 |
| Linux | toxcore-utils Ubuntu 25.04 (plucky) | 0.2.13-1 | [toxcore-utils 0.2.13-1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-toxcore-utils-0.2.13-1.md) | Jan 16, 2026 |

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Data as of 2026-11-08T13:06:02Z 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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