SOC status:Duty analyst on shift

UK Cyber Defence
VulnerabilityModified

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…

MEDIUM 4.3EPSS 3.72%

Does this matter?

Lower severity and a low EPSS score (3.72%). Track it; it rarely justifies an emergency change on its own.

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.

CVSS 2.0
4.3 MEDIUMAV:N/AC:M/Au:N/C:P/I:N/A:N
EPSS
3.72% probability · 90th percentile
Public exploits
None in Exploit-DB
CISA KEV
Not listed
Weakness
CWE-203
Affected
mozilla/network security services · canonical/ubuntu linux · oracle/enterprise manager ops center · oracle/glassfish communications server · oracle/glassfish server · oracle/iplanet web proxy server · oracle/iplanet web server · oracle/opensso · oracle/traffic director · oracle/vm server · redhat/enterprise linux desktop · redhat/enterprise linux eus · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux workstation
Source
cve@mitre.org
EPSS trend
0%3%5%26 October 2026: 3.72%26 October 202626 October 2026

EPSS 3.7% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.

References

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.