# CVE-2025-27810: mbedtls: Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of failed memory allocation or hardware errors, uses unin...

CVE-2025-27810 is fixed in 13 products on 1 platform, first by DEBIAN-CVE-2025-27810, released March 25, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2025-27810
- Priority: Routine
- CVSS: 4.8 (medium)
- EPSS: 0.0030
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Mar 24, 2025

## Description

Mbed TLS before 2.28.10 and 3.x before 3.6.3, in some cases of failed memory allocation or hardware errors, uses uninitialized stack memory to compose the TLS Finished message, potentially leading to authentication bypasses such as replays.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libmbedcrypto1 Ubuntu 18.04.6 LTS (bionic) | 2.8.0-1ubuntu0.1~esm1 | [libmbedcrypto1 2.8.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libmbedcrypto1-2.8.0-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedcrypto3 Ubuntu 20.04 LTS (focal) | 2.16.4-1ubuntu2+esm1 | [libmbedcrypto3 2.16.4-1ubuntu2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmbedcrypto3-2.16.4-1ubuntu2-esm1.md) | Jul 20, 2025 |
| Linux | libmbedcrypto7 Ubuntu 22.04.1 LTS (jammy) | 2.28.0-1ubuntu0.1~esm1 | [libmbedcrypto7 2.28.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmbedcrypto7-2.28.0-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedcrypto7t64 Ubuntu 24.04.5 LTS (noble) | 2.28.8-1ubuntu0.1~esm1 | [libmbedcrypto7t64 2.28.8-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libmbedcrypto7t64-2.28.8-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedtls10 Ubuntu 18.04.6 LTS (bionic) | 2.8.0-1ubuntu0.1~esm1 | [libmbedtls10 2.8.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libmbedtls10-2.8.0-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedtls12 Ubuntu 20.04 LTS (focal) | 2.16.4-1ubuntu2+esm1 | [libmbedtls12 2.16.4-1ubuntu2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmbedtls12-2.16.4-1ubuntu2-esm1.md) | Jul 20, 2025 |
| Linux | libmbedtls14 Ubuntu 22.04.1 LTS (jammy) | 2.28.0-1ubuntu0.1~esm1 | [libmbedtls14 2.28.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmbedtls14-2.28.0-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedtls14t64 Ubuntu 24.04.5 LTS (noble) | 2.28.8-1ubuntu0.1~esm1 | [libmbedtls14t64 2.28.8-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libmbedtls14t64-2.28.8-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedx509-0 Ubuntu 18.04.6 LTS (bionic) | 2.8.0-1ubuntu0.1~esm1 | [libmbedx509-0 2.8.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libmbedx509-0-2.8.0-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedx509-0 Ubuntu 20.04 LTS (focal) | 2.16.4-1ubuntu2+esm1 | [libmbedx509-0 2.16.4-1ubuntu2+esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libmbedx509-0-2.16.4-1ubuntu2-esm1.md) | Jul 20, 2025 |
| Linux | libmbedx509-1 Ubuntu 22.04.1 LTS (jammy) | 2.28.0-1ubuntu0.1~esm1 | [libmbedx509-1 2.28.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libmbedx509-1-2.28.0-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | libmbedx509-1t64 Ubuntu 24.04.5 LTS (noble) | 2.28.8-1ubuntu0.1~esm1 | [libmbedx509-1t64 2.28.8-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libmbedx509-1t64-2.28.8-1ubuntu0.1-esm1.md) | Jul 20, 2025 |
| Linux | mbedtls Debian 13.5 (trixie) | 3.6.3-1 | [DEBIAN-CVE-2025-27810](https://patchblox.com/security/data/fix/linux/debian-cve-2025-27810.md) | Mar 25, 2025 |
| Linux | mbedtls Debian 14 | 3.6.3-1 | [DEBIAN-CVE-2025-27810](https://patchblox.com/security/data/fix/linux/debian-cve-2025-27810.md) | Mar 25, 2025 |
| Linux | mbedtls opensuse-leap 16.0 | 3.6.6-bp160.1.1 | [OPENSUSE-SU-2026:21144-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21144-1.md) | Jun 22, 2026 |
| Linux | mbedtls-2 opensuse-leap 16.0 | 2.28.10-bp160.1.1 | [OPENSUSE-SU-2026:21145-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21145-1.md) | Jun 22, 2026 |

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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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