# CVE-2018-7284: Memory corruption in n/a

> A buffer overflow in Asterisk's res_pjsip_pubsub module allows remote attackers to cause a denial of service via crafted SUBSCRIBE requests with excessive Accept headers.

- **Severity:** High 7.5 (`CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 22 Feb 2018
- **Updated:** 5 Aug 2024
- **Also known as:** DEBIAN-CVE-2018-7284, GHSA-h9x3-h6rr-35ww, UBUNTU-CVE-2018-7284

## What is CVE-2018-7284?

CVE-2018-7284 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 22 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A Buffer Overflow issue was discovered in Asterisk through 13.19.1, 14.x through 14.7.5, and 15.x through 15.2.1, and Certified Asterisk through 13.18-cert2. When processing a SUBSCRIBE request, the res_pjsip_pubsub module stores the accepted formats present in the Accept headers of the request. This code did not limit the number of headers it processed, despite having a fixed limit of 32. If more than 32 Accept headers were present, the code would write outside of its memory and cause a crash.

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

## Which versions are affected by CVE-2018-7284?

It affects 3 products.


Products: Debian Debian Linux, Digium Asterisk, Digium Certified Asterisk.

## How do I fix CVE-2018-7284?

Apply the vendor's patch.

## Is CVE-2018-7284 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-7284 exists.

Public exploit code:

- Asterisk chan_pjsip 15.2.0 - 'SUBSCRIBE' Stack Corruption (exploitdb)
- Tool to exploit CVE-2018-7284 and CVE-2018-19278 (github_poc): https://github.com/Rodrigo-D/astDoS

## 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-2018-7284 and fix it if it is affected.

What it is: CVE-2018-7284 is a high-severity memory corruption vulnerability in Debian Debian Linux, published on 22 Feb 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2018-7284 exists.

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-2018-7284/ (Markdown: https://insights.sbomify.com/CVE-2018-7284/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2018-7284
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2018-7284
- OSV: https://osv.dev/vulnerability/CVE-2018-7284

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From sbomify Insights: https://insights.sbomify.com/CVE-2018-7284/
Summaries are generated and may contain mistakes; the official description above is the record.