CVE-2021-30246 RSA signature validation vulnerability on maleable encoded message in jsrsasign
The jsrsasign library incorrectly validates certain invalid RSA signatures, potentially allowing attackers to bypass cryptographic verification mechanisms.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-30246?
CVE-2021-30246 is a critical vulnerability in n/a, published on 7 Apr 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
In the jsrsasign package through 10.1.13 for Node.js, some invalid RSA PKCS#1 v1.5 signatures are mistakenly recognized to be valid. NOTE: there is no known practical attack.
Weakness: CWE-347
Which versions are affected by CVE-2021-30246?
2 open source packages ship an affected version, including jsrsasign. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
jsrsasign npm | All versions | 10.2.0 |
jsrsasign npm | All versions | 10.2.0 |
Products include Kjur Jsrsasign.
How do I fix CVE-2021-30246?
Upgrade jsrsasign to 10.2.0 or later.
Is CVE-2021-30246 being exploited?
There is no known exploitation of CVE-2021-30246 in the wild and no public exploit code.
Other vulnerabilities in n/a
- CVE-2020-14967 RSA PKCS#1 decryption vulnerability with prepending zeros in jsrsasign
- CVE-2020-14968 RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign
- CVE-2026-4601 jsrsasign: Missing cryptographic validation during DSA signing enables private key extraction
- CVE-2026-4599 jsrsasign: Incomplete Comparison Allows DSA Private Key Recovery via Biased Nonce Generation
- CVE-2026-4600 jsrsasign: DSA signatures or X.509 certificates can be forged via DSA domain-parameter validation in KJUR.crypto.DSA.setPublic
Sources
Also known as GHSA-27fj-mc8w-j9wg.