# CVE-2021-1424: Cisco ASR 5000 Series Software (StarOS) ipsecmgr Process Denial of Service Vulnerability

> Remote attackers can cause a denial of service by sending malformed IKEv2 packets to Cisco ASR 5000 devices, requiring software updates.

- **Severity:** Medium 5.3 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/RL:X/RC:X/E:X`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Nov 2024
- **Updated:** 18 Nov 2024
- **Also known as:** GHSA-7q9w-6xw2-qfxq

## What is CVE-2021-1424?

CVE-2021-1424 is a medium-severity denial of service vulnerability in Cisco ASR 5000 Series Software, published on 18 Nov 2024. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

A vulnerability in the ipsecmgr process of Cisco ASR 5000 Series Software (StarOS) could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition.
This vulnerability is due to insufficient validation of incoming Internet Key Exchange Version 2 (IKEv2) packets. An attacker could exploit this vulnerability by sending specifically malformed IKEv2 packets to an affected device. A successful exploit could allow the attacker to cause the ipsecmgr process to restart, which would disrupt ongoing IKE negotiations and result in a temporary DoS condition.Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability.

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

## Which versions are affected by CVE-2021-1424?


## How do I fix CVE-2021-1424?

No fix has been published for CVE-2021-1424 yet. Limit exposure of the affected software until one is available.

## Is CVE-2021-1424 being exploited?

There is no known exploitation of CVE-2021-1424 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-1424 and fix it if it is affected.

What it is: CVE-2021-1424 is a medium-severity denial of service vulnerability in Cisco ASR 5000 Series Software, published on 18 Nov 2024. 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-2021-1424 in the wild and no public exploit code.

Affected product: Cisco ASR 5000 Series Software. 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-2021-1424/ (Markdown: https://insights.sbomify.com/CVE-2021-1424/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-1424
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-1424
- OSV: https://osv.dev/vulnerability/CVE-2021-1424

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-1424/
Summaries are generated and may contain mistakes; the official description above is the record.