# CVE-2021-28235: etcd: Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug f...

CVE-2021-28235 is fixed in 4 products on 1 platform, first by etcd 3.2.17+dfsg-1ubuntu0.1+esm2, released April 4, 2023. It is not reported as exploited. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2021-28235
- Priority: Urgent
- CVSS: 9.8 (critical)
- EPSS: 0.0162
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 4, 2023

## Description

Authentication vulnerability found in Etcd-io v.3.4.10 allows remote attackers to escalate privileges via the debug function.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | etcd Debian 13.5 (trixie) | 3.4.30-1 | [DEBIAN-CVE-2021-28235](https://patchblox.com/security/data/fix/linux/debian-cve-2021-28235.md) | Apr 4, 2023 |
| Linux | etcd Debian 14 | 3.4.30-1 | [DEBIAN-CVE-2021-28235](https://patchblox.com/security/data/fix/linux/debian-cve-2021-28235.md) | Apr 4, 2023 |
| Linux | etcd Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1+esm2 | [etcd 3.2.17+dfsg-1ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-etcd-3.2.17-dfsg-1ubuntu0.1-esm2.md) | Apr 4, 2023 |
| Linux | etcd Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.2+esm1 | [etcd 3.2.26+dfsg-6ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-etcd-3.2.26-dfsg-6ubuntu0.2-esm1.md) | Apr 4, 2023 |
| Linux | etcd Ubuntu 22.04.1 LTS (jammy) | 3.3.25+dfsg-7ubuntu0.22.04.1+esm1 | [etcd 3.3.25+dfsg-7ubuntu0.22.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-etcd-3.3.25-dfsg-7ubuntu0.22.04.1-esm1.md) | Apr 4, 2023 |
| Linux | etcd opensuse-leap 15.6 | 3.5.12-bp156.4.3.1 | [OPENSUSE-SU-2025:0003-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2025-0003-1.md) | Jan 7, 2025 |
| Linux | etcd-client Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1+esm2 | [etcd-client 3.2.17+dfsg-1ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-etcd-client-3.2.17-dfsg-1ubuntu0.1-esm2.md) | Apr 4, 2023 |
| Linux | etcd-client Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.2+esm1 | [etcd-client 3.2.26+dfsg-6ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-etcd-client-3.2.26-dfsg-6ubuntu0.2-esm1.md) | Apr 4, 2023 |
| Linux | etcd-client Ubuntu 22.04.1 LTS (jammy) | 3.3.25+dfsg-7ubuntu0.22.04.1+esm1 | [etcd-client 3.3.25+dfsg-7ubuntu0.22.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-etcd-client-3.3.25-dfsg-7ubuntu0.22.04.1-esm1.md) | Apr 4, 2023 |
| Linux | etcd-server Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1+esm2 | [etcd-server 3.2.17+dfsg-1ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-etcd-server-3.2.17-dfsg-1ubuntu0.1-esm2.md) | Apr 4, 2023 |
| Linux | etcd-server Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.2+esm1 | [etcd-server 3.2.26+dfsg-6ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-etcd-server-3.2.26-dfsg-6ubuntu0.2-esm1.md) | Apr 4, 2023 |
| Linux | etcd-server Ubuntu 22.04.1 LTS (jammy) | 3.3.25+dfsg-7ubuntu0.22.04.1+esm1 | [etcd-server 3.3.25+dfsg-7ubuntu0.22.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-etcd-server-3.3.25-dfsg-7ubuntu0.22.04.1-esm1.md) | Apr 4, 2023 |
| Linux | golang-etcd-server-dev Ubuntu 18.04.6 LTS (bionic) | 3.2.17+dfsg-1ubuntu0.1+esm2 | [golang-etcd-server-dev 3.2.17+dfsg-1ubuntu0.1+esm2](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-golang-etcd-server-dev-3.2.17-dfsg-1ubuntu0.1-esm2.md) | Apr 4, 2023 |
| Linux | golang-etcd-server-dev Ubuntu 20.04 LTS (focal) | 3.2.26+dfsg-6ubuntu0.2+esm1 | [golang-etcd-server-dev 3.2.26+dfsg-6ubuntu0.2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-golang-etcd-server-dev-3.2.26-dfsg-6ubuntu0.2-esm1.md) | Apr 4, 2023 |
| Linux | golang-etcd-server-dev Ubuntu 22.04.1 LTS (jammy) | 3.3.25+dfsg-7ubuntu0.22.04.1+esm1 | [golang-etcd-server-dev 3.3.25+dfsg-7ubuntu0.22.04.1+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-golang-etcd-server-dev-3.3.25-dfsg-7ubuntu0.22.04.1-esm1.md) | Apr 4, 2023 |

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Data as of 2026-11-09T07:25:28Z 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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