The TLS implementation in Mozilla Network Security Services (NSS) does not properly consider timing side-channel attacks on a noncompliant MAC check operation during the processing of malformed CBC padding, which allows remote attackers to conduct distinguishing attacks and plaintext-recovery attacks via statistical analysis of timing data for crafted packets, a related issue to CVE-2013-0169.
Conclusion & alert: CVE-2013-1620 is rated Moderate Risk (43.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 0.85%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
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 | 2026-04-23 | 0.81% | 0.85% | +0.05% |
| 2 | 2025-12-28 | 0.59% | 0.81% | +0.21% |
| 3 | 2025-12-27 | — | 0.59% | — |
Full EPSS history (16 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
low | CVE-2013-1620 low priority: Debian including 1 source packages (nss), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2013-1620 |
gentoo
|
normal | CVE-2013-1620: 1 GLSA(s) (201406-19), 1 atom(s) (dev-libs/nss); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-1620 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2013-1620 |
suse
|
medium | CVE-2013-1620 severity moderate: SUSE including 167 source package names (libfreebl3-3.101.2-slfo.1.1_1.6, libfreebl3-3.112-160000.2.2, …), 405 product×package rows across 48 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 6, … (48 product lines)): Fixed 242, Known Not Affected 163. | https://www.suse.com/security/cve/CVE-2013-1620/ |
ubuntu
|
medium | CVE-2013-1620 medium priority: Ubuntu including 1 source packages (nss), 6 status rows across 6 suites (hardy, lucid, oneiric, precise, quantal, upstream): released 5, ignored 1. | https://ubuntu.com/security/CVE-2013-1620 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | network_security_services | < 3.14.3 | cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 10.04 | cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:* |
| canonical | ubuntu_linux | 11.10 | cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 12.04 | cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:* |
| canonical | ubuntu_linux | 12.10 | cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:* |
| oracle | enterprise_manager_ops_center | 11.1 | cpe:2.3:a:oracle:enterprise_manager_ops_center:11.1:*:*:*:*:*:*:* |
| oracle | enterprise_manager_ops_center | 12.1 | cpe:2.3:a:oracle:enterprise_manager_ops_center:12.1:*:*:*:*:*:*:* |
| oracle | enterprise_manager_ops_center | 12.2 | cpe:2.3:a:oracle:enterprise_manager_ops_center:12.2:*:*:*:*:*:*:* |
| oracle | glassfish_communications_server | 2.0 | cpe:2.3:a:oracle:glassfish_communications_server:2.0:*:*:*:*:*:*:* |
| oracle | glassfish_server | 2.1.1 | cpe:2.3:a:oracle:glassfish_server:2.1.1:*:*:*:*:*:*:* |
| oracle | iplanet_web_proxy_server | 4.0 | cpe:2.3:a:oracle:iplanet_web_proxy_server:4.0:*:*:*:*:*:*:* |
| oracle | iplanet_web_server | 6.1 | cpe:2.3:a:oracle:iplanet_web_server:6.1:*:*:*:*:*:*:* |
| oracle | iplanet_web_server | 7.0 | cpe:2.3:a:oracle:iplanet_web_server:7.0:*:*:*:*:*:*:* |
| oracle | opensso | 3.0-03 | cpe:2.3:a:oracle:opensso:3.0-03:*:*:*:*:*:*:* |
| oracle | traffic_director | 11.1.1.6.0 | cpe:2.3:a:oracle:traffic_director:11.1.1.6.0:*:*:*:*:*:*:* |
| oracle | traffic_director | 11.1.1.7.0 | cpe:2.3:a:oracle:traffic_director:11.1.1.7.0:*:*:*:*:*:*:* |
| oracle | vm_server | 3.2 | cpe:2.3:a:oracle:vm_server:3.2:*:*:*:*:*:x86:* |
| redhat | enterprise_linux_desktop | 5.0 | cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_desktop | 6.0 | cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_eus | 5.9 | cpe:2.3:o:redhat:enterprise_linux_eus:5.9:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server | 5.0 | cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server | 6.0 | cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_server_aus | 5.9 | cpe:2.3:o:redhat:enterprise_linux_server_aus:5.9:*:*:*:*:*:*:* |
| redhat | enterprise_linux_workstation | 5.0 | cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:* |
| redhat | enterprise_linux_workstation | 6.0 | cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:* |