# CVE-2017-3735: Information disclosure in OpenSSL

> A one-byte overread in OpenSSL's X.509 certificate parsing allows attackers to read adjacent memory, potentially disclosing sensitive information.

- **Severity:** Medium 5.3 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 28 Aug 2017
- **Updated:** 16 Sep 2024
- **Also known as:** ALPINE-CVE-2017-3735, DEBIAN-CVE-2017-3735, DLA-1157-1, DSA-4018-1, GHSA-6h3q-hmhp-4vgv, SUSE-SU-2017:2968-1, SUSE-SU-2017:2981-1, UBUNTU-CVE-2017-3735

## What is CVE-2017-3735?

CVE-2017-3735 is a medium-severity vulnerability in Debian Debian Linux, published on 28 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

While parsing an IPAddressFamily extension in an X.509 certificate, it is possible to do a one-byte overread. This would result in an incorrect text display of the certificate. This bug has been present since 2006 and is present in all versions of OpenSSL before 1.0.2m and 1.1.0g.

Weakness: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer)

## Which versions are affected by CVE-2017-3735?

It affects 2 products.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `openssl1` | SUSE:Linux Enterprise Server 11-SECURITY | All versions | 1.0.1g-0.58.3.1 |
| `openssl` | SUSE:Linux Enterprise Server 12 SP1-LTSS | All versions | 1.0.1i-54.8.1 |
| `openssl` | SUSE:Linux Enterprise Server for SAP Applications 12 SP1 | All versions | 1.0.1i-54.8.1 |
| `openssl` | SUSE:OpenStack Cloud 6 | All versions | 1.0.1i-54.8.1 |

Products: Debian Debian Linux, Openssl Openssl.

## How do I fix CVE-2017-3735?

Upgrade to a fixed version.

## Is CVE-2017-3735 being exploited?

There is no known exploitation of CVE-2017-3735 in the wild and no public exploit code.

## Other vulnerabilities in Debian Debian Linux

- [CVE-2015-3306](https://insights.sbomify.com/CVE-2015-3306/): ProFTPD Improper Access Control (critical 10.0, exploited in the wild)
- [CVE-2025-49113](https://insights.sbomify.com/CVE-2025-49113/): RoundCube Webmail Deserialization of Untrusted Data (critical 9.9, exploited in the wild)
- [CVE-2026-24061](https://insights.sbomify.com/CVE-2026-24061/): GNU InetUtils Argument Injection (critical 9.8, exploited in the wild)
- [CVE-2025-39682](https://insights.sbomify.com/CVE-2025-39682/): Linux Kernel Improper Check for Unusual or Exceptional Conditions (critical 9.8, exploited in the wild)
- [CVE-2024-9680](https://insights.sbomify.com/CVE-2024-9680/): Mozilla Firefox Use-After-Free (critical 9.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2017-3735 and fix it if it is affected.

What it is: CVE-2017-3735 is a medium-severity vulnerability in Debian Debian Linux, published on 28 Aug 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: There is no known exploitation of CVE-2017-3735 in the wild and no public exploit code.

Affected product: Debian Debian Linux. 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-2017-3735/ (Markdown: https://insights.sbomify.com/CVE-2017-3735/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2017-3735
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2017-3735
- OSV: https://osv.dev/vulnerability/CVE-2017-3735

---
From sbomify Insights: https://insights.sbomify.com/CVE-2017-3735/
Summaries are generated and may contain mistakes; the official description above is the record.