# CVE-2021-4076: tang: A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.

CVE-2021-4076 is fixed in tang on 1 platform, first by DSA-5025-1, released December 19, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-4076
- Priority: High
- CVSS: 7.5 (high)
- EPSS: 0.0156
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Dec 19, 2021

## Description

A flaw exists in tang, a network-based cryptographic binding server, which could result in leak of private keys.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | tang Debian 11.6 (bullseye) | 8-3+deb11u1 | [DSA-5025-1](https://patchblox.com/security/data/fix/linux/dsa-5025-1.md) | Dec 19, 2021 |
| Linux | tang Debian 12.15 (bookworm) | 11-1 | [DEBIAN-CVE-2021-4076](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4076.md) | Mar 2, 2022 |
| Linux | tang Debian 13.5 (trixie) | 11-1 | [DEBIAN-CVE-2021-4076](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4076.md) | Mar 2, 2022 |
| Linux | tang Debian 14 | 11-1 | [DEBIAN-CVE-2021-4076](https://patchblox.com/security/data/fix/linux/debian-cve-2021-4076.md) | Mar 2, 2022 |

---

Data as of 2026-11-08T00:53:09Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.