# CVE-2025-27587: Information disclosure in n/a

> A timing side-channel in OpenSSL on PowerPC allows local attackers to extract private keys via statistical analysis of signing times.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Any signed-in user
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 16 Jun 2025
- **Updated:** 26 Jun 2025
- **Also known as:** DEBIAN-CVE-2025-27587, GHSA-jqr3-3jm7-r6cm, SUSE-SU-2025:02236-1, SUSE-SU-2025:1550-1, SUSE-SU-2025:20417-1

## What is CVE-2025-27587?

CVE-2025-27587 is a medium-severity vulnerability in n/a, published on 16 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.

### Official description

OpenSSL 3.0.0 through 3.3.2 on the PowerPC architecture is vulnerable to a Minerva attack, exploitable by measuring the time of signing of random messages using the EVP_DigestSign API, and then using the private key to extract the K value (nonce) from the signatures. Next, based on the bit size of the extracted nonce, one can compare the signing time of full-sized nonces to signatures that used smaller nonces, via statistical tests. There is a side-channel in the P-364 curve that allows private key extraction (also, there is a dependency between the bit size of K and the size of the side channel). NOTE: This CVE is disputed because the OpenSSL security policy explicitly notes that any side channels which require same physical system to be detected are outside of the threat model for the software. The timing signal is so small that it is infeasible to be detected without having the attacking process running on the same physical system.

Weakness: CWE-385 (Covert Timing Channel)

## Which versions are affected by CVE-2025-27587?


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `openssl-3` | SUSE:Linux Enterprise Module for Basesystem 15 SP6 | All versions | 3.1.4-150600.5.27.1 |
| `openssl-3` | SUSE:Linux Enterprise Module for Basesystem 15 SP7 | All versions | 3.2.3-150700.5.10.1 |
| `openssl-3` | SUSE:Linux Micro 6.1 | All versions | 3.1.4-slfo.1.1_5.1 |
| `openssl-3` | openSUSE:Leap 15.6 | All versions | 3.1.4-150600.5.27.1 |

## How do I fix CVE-2025-27587?

Apply the vendor's patch.

## Is CVE-2025-27587 being exploited?

There is no known exploitation of CVE-2025-27587 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-27587 and fix it if it is affected.

What it is: CVE-2025-27587 is a medium-severity vulnerability in n/a, published on 16 Jun 2025. Any signed-in user can exploit it over the network, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2025-27587 in the wild and no public exploit code.

Affected product: n/a. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2025-27587/ (Markdown: https://insights.sbomify.com/CVE-2025-27587/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-27587
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-27587
- OSV: https://osv.dev/vulnerability/CVE-2025-27587

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-27587/
Summaries are generated and may contain mistakes; the official description above is the record.