# socket2 invalidly assumes the memory layout of std::net::SocketAddr

Advisory record · `GHSA-458v-4hrf-g3m4`

- **Identifiers:** `GHSA-458v-4hrf-g3m4` · `CVE-2020-35919` · `CVE-2020-35920` · `GHSA-c79c-gwph-gqfm` · `RUSTSEC-2020-0078` · `RUSTSEC-2020-0079`
- **State:** Confirmed
- **Severity:** CVSS 5.5 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-188](https://cwe.mitre.org/data/definitions/188.html)
- **Tags:** [CWE-188](https://agentprime.io/advisories/tag/cwe-188.md)
- **Published:** 25 Aug 2021
- **Updated:** 12 Feb 2024
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 25 Aug 2021, 20:50 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `socket2` (crates.io): affected `<0.3.16`; fixed in `0.3.16`
- `net2` (crates.io): affected `<0.2.36`; fixed in `0.2.36`

## Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

## Severity and exploitation

- 5.5 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H`, from GitHub Advisory Database

- **CISA KEV:** Not listed.
- **EPSS:** 0.0041, the 35th percentile, on 6 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 15:20 UTC: First seen by agentprime
- 31 Oct 2026, 15:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-458v-4hrf-g3m4)

## Sources

- [GitHub Advisory Database: GHSA-458v-4hrf-g3m4](https://github.com/advisories/GHSA-458v-4hrf-g3m4)
- [OSV: GHSA-458v-4hrf-g3m4](https://osv.dev/vulnerability/GHSA-458v-4hrf-g3m4)
- <https://nvd.nist.gov/vuln/detail/CVE-2020-35920>
- <https://github.com/deprecrated/net2-rs/issues/105>
- <https://github.com/rust-lang/socket2-rs/issues/119>
- <https://github.com/rust-lang/socket2-rs>
- <https://rustsec.org/advisories/RUSTSEC-2020-0078.html>
- <https://rustsec.org/advisories/RUSTSEC-2020-0079.html>

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.

## Check whether this affects you

A Match means an installed version is in the affected range above. Most don’t affect the app; agentprime hasn’t analysed this one yet.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), ask your agent to check the project: `check_lockfile` sends a lockfile, `check_packages` a list of installed packages, and both return the Matches and the upgrades that clear them. `get_advisory` returns this record. Setup: <https://agentprime.io/mcp.md>
- In a browser: <https://agentprime.io/check/> reads your lockfile in the browser, never uploading it.
- Whether it touches your code, with file and line: the Claude Code plugin, <https://agentprime.io/plugin.md>
- As JSON: <https://api.agentprime.io/v1/advisories/GHSA-458v-4hrf-g3m4>, or `POST https://api.agentprime.io/v1/match` with your packages (<https://agentprime.io/api.md>)

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The web page: <https://agentprime.io/advisories/GHSA-458v-4hrf-g3m4/>. Everything for agents: <https://agentprime.io/llms.txt>.