# Generator Web Application: Local Privilege Escalation Vulnerability via System Temp Directory

Advisory record · `GHSA-pc22-3g76-gm6j`

- **Identifiers:** `GHSA-pc22-3g76-gm6j` · `CVE-2021-21363`
- **State:** Confirmed
- **Severity:** CVSS 5.3 Medium
- **Critical:** No
- **Weakness (CWE):** [CWE-378](https://cwe.mitre.org/data/definitions/378.html) · [CWE-379](https://cwe.mitre.org/data/definitions/379.html)
- **Tags:** [CWE-378](https://agentprime.io/advisories/tag/cwe-378.md) · [CWE-379](https://agentprime.io/advisories/tag/cwe-379.md)
- **Published:** 11 Mar 2021
- **Updated:** 8 Jul 2026
- **Reviewed by a person:** No

Published by the GitHub Advisory Database at 11 Mar 2021, 03:09 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

## Affected packages

- `io.swagger:swagger-codegen` (Maven): affected `<2.4.19`; fixed in `2.4.19`

## Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

> The io.swagger:swagger-codegen package before 2.4.19 creates a temporary subdirectory in the system's shared temporary directory in a way that can be raced. A local user on a Unix-like system could exploit this to write into the output folder, and code generated there and later executed could be attacker-controlled. Upgrade to version 2.4.19.

Written 2 Nov 2026.

## 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

- 5.3 Medium, CVSS 3.1: `CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:N/I:H/A:N`, from CNA (GitHub_M)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0041, the 35th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 31 Oct 2026, 14:20 UTC: First seen by agentprime
- 31 Oct 2026, 14:20 UTC: [Confirmed by OSV](https://osv.dev/vulnerability/GHSA-pc22-3g76-gm6j)

## Sources

- [GitHub Advisory Database: GHSA-pc22-3g76-gm6j](https://github.com/advisories/GHSA-pc22-3g76-gm6j)
- [OSV: GHSA-pc22-3g76-gm6j](https://osv.dev/vulnerability/GHSA-pc22-3g76-gm6j)
- <https://github.com/swagger-api/swagger-codegen/security/advisories/GHSA-pc22-3g76-gm6j>
- <https://nvd.nist.gov/vuln/detail/CVE-2021-21363>
- <https://github.com/swagger-api/swagger-codegen/commit/987ea7a30b463cc239580d6ad166c707ae942a89>

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-pc22-3g76-gm6j>, 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-pc22-3g76-gm6j/>. Everything for agents: <https://agentprime.io/llms.txt>.