GHSA-q3gh-5r98-j4h3 · Severity: critical · Ecosystem: npm — RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign
An issue was discovered in the jsrsasign package before 8.0.17 for Node.js. Its RSASSA-PSS (RSA-PSS) implementation does not detect signature manipulation/modification by prepending '\0' bytes to a signature (it accepts these modified signatures as valid). An attacker can abuse this behavior in an application by creating multiple valid signatures where only one signature should exist. Also, an attacker might prepend these bytes with the goal of triggering memory corruption issues.
Conclusion & alert: CVE-2020-14968 is rated High Exploit Risk (76.9/100): CVSS Critical severity, with medium exploitation likelihood (EPSS 0.55%). Core evidence: 1 public exploit reference(s) are indexed (Exploit-DB). Mandatory action: Public exploits are available—assess exposure, apply mitigations, and prioritize patching.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
| EDB-ID | Source | Kind | Published | Link |
|---|---|---|---|---|
| — | nvd_ref | exploit_tag | Exploit-DB ↗ |
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2025-11-21 | 1.24% | 0.55% | -0.70% |
| 2 | 2025-11-18 | 0.49% | 1.24% | +0.75% |
| 3 | 2025-03-30 | — | 0.49% | — |
Full EPSS history (17 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.8 | 3.1 | CRITICAL |
|
3.9 | 5.9 | [email protected] |
| 7.5 | 2.0 | HIGH |
|
10.0 | 6.4 | [email protected] |
GHSA-q3gh-5r98-j4h3 · Severity: critical · Ecosystem: npm — RSA-PSS signature validation vulnerability by prepending zeros in jsrsasign
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| jsrsasign_project | jsrsasign | < 8.0.17 | cpe:2.3:a:jsrsasign_project:jsrsasign:*:*:*:*:*:node.js:*:* |
| netapp | max_data | — | cpe:2.3:a:netapp:max_data:-:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| https://github.com/kjur/jsrsasign/issues/438 | Exploit Issue Tracking Third Party Advisory |
| https://github.com/kjur/jsrsasign/releases/tag/8.0.17 | Release Notes Third Party Advisory |
| https://github.com/kjur/jsrsasign/releases/tag/8.0.18 | Release Notes Third Party Advisory |
| https://kjur.github.io/jsrsasign/ | Release Notes Third Party Advisory |
| https://security.netapp.com/advisory/ntap-20200724-0001/ | Third Party Advisory |
| https://www.npmjs.com/package/jsrsasign | Product Third Party Advisory |