CVE•Published 2021-04-07•Modified 2026-06-22•1 article on news•6 live references•NVD data
CVE-2021-30246Kjur · Jsrsasign
Vulnerability data via NVD (ingested)
CVSS v3.1
9.1
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS percentile
57
Exploit Prediction Scoring System · top 43% of all CVEs
Weaknesses (CWE)
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.
Timeline
Published 2021-04-07
Modified 2026-06-22
External references
Search for exposed instances
Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).
Shodan · vuln tag0 hosts
vuln:CVE-2021-30246Hosts Shodan has explicitly fingerprinted as vulnerable.
Shodan · product
product:"Kjur Jsrsasign"All exposed Kjur Jsrsasign instances — cross-reference with the CVE's affected-version range.
Shodan · banner/body mention
http.html:"Jsrsasign"HTTP body or banner mentions "Jsrsasign" — catches deploys Shodan didn't identify as a product.
More intel sources (5)
Shodan report
vuln:CVE-2021-30246Country / ASN / product breakdown for the vuln query.
Censys
vulnerabilities.cve_id: CVE-2021-30246Censys host search filtered to this CVE id.
grep.app
CVE-2021-30246Public source-code mentions — fast PoC discovery.
GitHub code
CVE-2021-30246GitHub code search for direct mentions.
Google dork
"CVE-2021-30246" exploit -site:nvd.nist.govWrite-ups and news, NVD excluded.