# CVE-2021-33516: gir1.2-gupnp-1.6: An issue was discovered in GUPnP before 1.0.7 and 1.1.x and 1.2.x before1.2.5

CVE-2021-33516 is fixed in 6 products on 1 platform, first by gir1.2-gupnp-1.2 1.2.3-0ubuntu0.20.04.2, released May 24, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-33516
- Priority: High
- CVSS: 8.3 (Medium)
- EPSS: 0.0108
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 24, 2021

## Description

An issue was discovered in GUPnP before 1.0.7 and 1.1.x and 1.2.x before1.2.5. It allows DNS rebinding. A remote web server can exploit thisvulnerability to trick a victim's browser into triggering actions againstlocal UPnP services implemented using this library. Depending on theaffected service, this could be used for data exfiltration, data tempering,etc.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | gir1.2-gupnp-1.2 Ubuntu 20.04 LTS (focal) | 1.2.3-0ubuntu0.20.04.2 | [gir1.2-gupnp-1.2 1.2.3-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-gir1.2-gupnp-1.2-1.2.3-0ubuntu0.20.04.2.md) | May 24, 2021 |
| Linux | gir1.2-gupnp-1.6 Ubuntu 24.10 (oracular) | 1.2.4-1ubuntu1 | [gir1.2-gupnp-1.6 1.2.4-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-gir1.2-gupnp-1.6-1.2.4-1ubuntu1.md) | Jan 16, 2026 |
| Linux | gir1.2-gupnp-1.6 Ubuntu 25.04 (plucky) | 1.2.4-1ubuntu1 | [gir1.2-gupnp-1.6 1.2.4-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-gir1.2-gupnp-1.6-1.2.4-1ubuntu1.md) | Jan 16, 2026 |
| Linux | gupnp RHEL 8 | 0:1.0.6-2.el8_4 | [RHSA-2021:2363](https://patchblox.com/security/data/fix/linux/rhsa-2021-2363.md) | Jun 9, 2021 |
| Linux | gupnp ol 8 | 0:1.0.6-2.el8_4 | [ELSA-2021-2363](https://patchblox.com/security/data/fix/linux/elsa-2021-2363.md) | Jun 10, 2021 |
| Linux | gupnp-devel RHEL 8 | 0:1.0.6-2.el8_4 | [RHSA-2021:2363](https://patchblox.com/security/data/fix/linux/rhsa-2021-2363.md) | Jun 9, 2021 |
| Linux | gupnp-devel ol 8 | 0:1.0.6-2.el8_4 | [ELSA-2021-2363](https://patchblox.com/security/data/fix/linux/elsa-2021-2363.md) | Jun 10, 2021 |
| Linux | libgupnp-1.2-0 Ubuntu 20.04 LTS (focal) | 1.2.3-0ubuntu0.20.04.2 | [libgupnp-1.2-0 1.2.3-0ubuntu0.20.04.2](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libgupnp-1.2-0-1.2.3-0ubuntu0.20.04.2.md) | May 24, 2021 |
| Linux | libgupnp-1.6-0 Ubuntu 24.10 (oracular) | 1.2.4-1ubuntu1 | [libgupnp-1.6-0 1.2.4-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-oracular-libgupnp-1.6-0-1.2.4-1ubuntu1.md) | Jan 16, 2026 |
| Linux | libgupnp-1.6-0 Ubuntu 25.04 (plucky) | 1.2.4-1ubuntu1 | [libgupnp-1.6-0 1.2.4-1ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-plucky-libgupnp-1.6-0-1.2.4-1ubuntu1.md) | Jan 16, 2026 |

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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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