# CVE-2021-42870: Memory corruption in n/a

> An out-of-bounds read in ACCEL-PPP allows attackers to cause denial of service or disclose sensitive memory contents via crafted requests.

- **Severity:** High 7.5 (`CVSS:3.1/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:** No
- **Published:** 16 May 2022
- **Updated:** 4 Aug 2024
- **Also known as:** GHSA-qpw6-gmmf-vxhp

## What is CVE-2021-42870?

CVE-2021-42870 is a high-severity memory corruption vulnerability in n/a, published on 16 May 2022. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

ACCEL-PPP 1.12.0 has an out-of-bounds read in post_msg when processing a call_clear_request.

Weakness: CWE-125 (Out-of-bounds Read)

## Which versions are affected by CVE-2021-42870?

It affects 1 product.


Products: Accel-Ppp Accel-Ppp.

## How do I fix CVE-2021-42870?

No fix has been published for CVE-2021-42870 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-42870 being exploited?

There is no known exploitation of CVE-2021-42870 in the wild and no public exploit code.

## Other vulnerabilities in n/a

- [CVE-2022-0982](https://insights.sbomify.com/CVE-2022-0982/): Buffer Overflow via crafted client request in Accel-PPP v1.12 (critical 9.8)
- [CVE-2022-24704](https://insights.sbomify.com/CVE-2022-24704/): Buffer Overflow via Crafted IPv6 Addr Attribute Type Client Request in Accel-PPP v1.12 (critical 9.8)
- [CVE-2022-24705](https://insights.sbomify.com/CVE-2022-24705/): Buffer Overflow via Crafted Ipv6 Prefix Attribute Type Client Request in accel-ppp v1.12 (critical 9.8)
- [CVE-2020-28194](https://insights.sbomify.com/CVE-2020-28194/): Integer overflow in n/a (critical 9.8)
- [CVE-2020-15173](https://insights.sbomify.com/CVE-2020-15173/): Heap buffer overflow in ACCEL-PPP (high 8.2)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-42870 and fix it if it is affected.

What it is: CVE-2021-42870 is a high-severity memory corruption vulnerability in n/a, published on 16 May 2022. 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-2021-42870 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-2021-42870/ (Markdown: https://insights.sbomify.com/CVE-2021-42870/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-42870
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-42870
- OSV: https://osv.dev/vulnerability/CVE-2021-42870

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-42870/
Summaries are generated and may contain mistakes; the official description above is the record.