How severe is CVE-2013-1620?

CVE-2013-1620 has a CVSS 2.0 base score of 4.3, rated medium severity.

Is CVE-2013-1620 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2013-1620?

CVE-2013-1620 primarily affects Mozilla Network Security Services. In total, 25 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2013-1620?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2013-1620 published?

CVE-2013-1620 was published on 2013-02-08 and last updated on 2026-06-16.

CVE-2013-1620

CVE-2013-1620 is a medium-severity vulnerability in Mozilla Network Security Services with a CVSS 2.0 base score of 4.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-203.

Key facts

Severity: Medium (CVSS 2.0 base score 4.3)
EPSS exploit prediction: 4% (88th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-203
Affected product: Mozilla Network Security Services
Published: 2013-02-08
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2013-1620?: 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.
How severe is CVE-2013-1620?: CVE-2013-1620 has a CVSS 2.0 base score of 4.3, rated medium severity.
Is CVE-2013-1620 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 4% (88th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2013-1620?: CVE-2013-1620 primarily affects Mozilla Network Security Services. In total, 25 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2013-1620?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2013-1620 published?: CVE-2013-1620 was published on 2013-02-08 and last updated on 2026-06-16.

References

Affected products (25)

cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_manager_ops_center:11.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:enterprise_manager_ops_center:12.2:*:*:*:*:*:*:*
cpe:2.3:a:oracle:glassfish_communications_server:2.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:glassfish_server:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:iplanet_web_proxy_server:4.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:iplanet_web_server:6.1:*:*:*:*:*:*:*
cpe:2.3:a:oracle:iplanet_web_server:7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:opensso:3.0-03:*:*:*:*:*:*:*
cpe:2.3:a:oracle:traffic_director:11.1.1.6.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:traffic_director:11.1.1.7.0:*:*:*:*:*:*:*
cpe:2.3:a:oracle:vm_server:3.2:*:*:*:*:*:x86:*
cpe:2.3:o:redhat:enterprise_linux_desktop:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_desktop:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:5.9:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server:6.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:5.9:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:5.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_workstation:6.0:*:*:*:*:*:*:*

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