Quick answers
- Is CVE-2021-23594 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2021-23594 being exploited in the wild.
- How severe is CVE-2021-23594?
- Low severity, with a CVSS score of 3.1, published 12 January 2022.
- Which products and versions are affected?
- realms-shim (npm) SEMVER:introduced=0,last_affected=1.2.2.
- Is there a fix for CVE-2021-23594?
- No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
- How is CVE-2021-23594 attacked?
- It is attacked over the network.
- Am I affected by CVE-2021-23594?
- Check whether you run realms-shim (npm) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
The vulnerability is a prototype pollution attack (CWE-1321) affecting all versions of realms-shim up to and including 1.2.2. By polluting the prototype chain, an attacker can escape the intended sandbox isolation, leading to arbitrary code execution. The vulnerability is network-reachable and requires no authentication or user interaction—any code execution within the compromised realm can trigger the exploit. A patch is available; users should upgrade to a version beyond 1.2.2.
Affected products
- Agoric realms-shim all versions up to and including 1.2.2
Identifiers
- CVE-2021-23594
- GHSA-pwm7-qr6j-3vjg
Timeline
- 2022-01-10: disclosed: NVD published
- 2022-01-12: advisory: GHSA advisory published