# CVE-2025-59147: Suricata is Vulnerable to Detection Bypass via Crafted Multiple SYN Packets

> Attackers can bypass Suricata's detection or cause flow blocking by sending crafted multiple SYN packets with varying sequence numbers.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/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:** 1 Oct 2025
- **Updated:** 1 Oct 2025
- **Also known as:** DEBIAN-CVE-2025-59147, GHSA-v8hv-6v7x-4c2r, UBUNTU-CVE-2025-59147

## What is CVE-2025-59147?

CVE-2025-59147 is a high-severity vulnerability in Oisf Suricata, published on 1 Oct 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

Suricata is a network IDS, IPS and NSM engine developed by the OISF (Open Information Security Foundation) and the Suricata community. Versions 7.0.11 and below, as well as 8.0.0, are vulnerable to detection bypass when crafted traffic sends multiple SYN packets with different sequence numbers within the same flow tuple, which can cause Suricata to fail to pick up the TCP session. In IDS mode this can lead to a detection and logging bypass. In IPS mode this will lead to the flow getting blocked. This issue is fixed in versions 7.0.12 and 8.0.1.

Weakness: CWE-358 (Improperly Implemented Security Check for Standard)

## Which versions are affected by CVE-2025-59147?

It affects 1 product.


Products: Oisf Suricata.

## How do I fix CVE-2025-59147?

Upgrade to a fixed version.

## Is CVE-2025-59147 being exploited?

There is no known exploitation of CVE-2025-59147 in the wild and no public exploit code.

## Other vulnerabilities in Oisf Suricata

- [CVE-2023-35853](https://insights.sbomify.com/CVE-2023-35853/): Code injection in n/a (critical 9.8)
- [CVE-2021-37592](https://insights.sbomify.com/CVE-2021-37592/): Other in n/a (critical 9.8)
- [CVE-2018-10244](https://insights.sbomify.com/CVE-2018-10244/): Integer overflow in n/a (critical 9.8)
- [CVE-2026-94083](https://insights.sbomify.com/CVE-2026-94083/): Memory corruption in Suricata (critical 9.4)
- [CVE-2026-94084](https://insights.sbomify.com/CVE-2026-94084/): Use after free in Suricata (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2025-59147 and fix it if it is affected.

What it is: CVE-2025-59147 is a high-severity vulnerability in Oisf Suricata, published on 1 Oct 2025. 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-2025-59147 in the wild and no public exploit code.

Affected product: Oisf Suricata. 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-2025-59147/ (Markdown: https://insights.sbomify.com/CVE-2025-59147/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2025-59147
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2025-59147
- OSV: https://osv.dev/vulnerability/CVE-2025-59147

---
From sbomify Insights: https://insights.sbomify.com/CVE-2025-59147/
Summaries are generated and may contain mistakes; the official description above is the record.