# CVE-2021-45485: Information disclosure in n/a

> An attacker can exploit a hash table flaw in the Linux kernel IPv6 implementation to leak sensitive information by choosing specific source addresses.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:** 25 Dec 2021
- **Updated:** 4 Aug 2024
- **Also known as:** AZL-7109, DEBIAN-CVE-2021-45485, GHSA-4q84-7284-2fp5, UBUNTU-CVE-2021-45485

## What is CVE-2021-45485?

CVE-2021-45485 is a high-severity vulnerability in Linux kernel, published on 25 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

### Official description

In the IPv6 implementation in the Linux kernel before 5.13.3, net/ipv6/output_core.c has an information leak because of certain use of a hash table which, although big, doesn't properly consider that IPv6-based attackers can typically choose among many IPv6 source addresses.

Weakness: CWE-327 (Use of a Broken or Risky Cryptographic Algorithm)

## Which versions are affected by CVE-2021-45485?

It affects 26 products.


Products: Linux kernel, Netapp Aff A400 Firmware, Netapp All Flash Fabric-Attached Storage 8300 Firmware, Netapp All Flash Fabric-Attached Storage 8700 Firmware, Netapp Brocade Fabric Operating System Firmware, Netapp E-Series Santricity Os Controller, Netapp Fabric-Attached Storage 8300 Firmware, Netapp Fabric-Attached Storage 8700 Firmware, Netapp Fabric-Attached Storage A400 Firmware, Netapp H300e Firmware, Netapp H300s Firmware, Netapp H410c Firmware, Netapp H410s Firmware, Netapp H500e Firmware, Netapp H500s Firmware, Netapp H610c Firmware, Netapp H610s Firmware, Netapp H615c Firmware, Netapp H700e Firmware, Netapp H700s Firmware and 6 more.

## How do I fix CVE-2021-45485?

Apply the vendor's patch.

## Is CVE-2021-45485 being exploited?

There is no known exploitation of CVE-2021-45485 in the wild and no public exploit code.

Public exploit code:

- https://github.com/Satheesh575555/linux-4.19.72_CVE-2021-45485 (github_poc): https://github.com/Satheesh575555/linux-4.19.72_CVE-2021-45485

## Other vulnerabilities in Linux kernel

- [CVE-2026-53266](https://insights.sbomify.com/CVE-2026-53266/): Linux Kernel Out-of-Bounds Write (high 8.8, exploited in the wild)
- [CVE-2013-6282](https://insights.sbomify.com/CVE-2013-6282/): Linux Kernel Improper Input Validation (high 8.8, exploited in the wild)
- [CVE-2022-0185](https://insights.sbomify.com/CVE-2022-0185/): Linux Kernel Heap-Based Buffer Overflow (high 8.4, exploited in the wild)
- [CVE-2013-2094](https://insights.sbomify.com/CVE-2013-2094/): Linux Kernel Privilege Escalation (high 8.4, exploited in the wild)
- [CVE-2026-53362](https://insights.sbomify.com/CVE-2026-53362/): Linux Kernel Unspecified (high 7.8, exploited in the wild)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2021-45485 and fix it if it is affected.

What it is: CVE-2021-45485 is a high-severity vulnerability in Linux kernel, published on 25 Dec 2021. 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-2021-45485 in the wild and no public exploit code.

Affected product: Linux kernel. 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-2021-45485/ (Markdown: https://insights.sbomify.com/CVE-2021-45485/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2021-45485
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2021-45485
- OSV: https://osv.dev/vulnerability/CVE-2021-45485

---
From sbomify Insights: https://insights.sbomify.com/CVE-2021-45485/
Summaries are generated and may contain mistakes; the official description above is the record.