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CVE-2013-1620

15
FAUCET Score

CVE-2013-1620 describes a timing side-channel vulnerability in the TLS implementation of Mozilla Network Security Services (NSS), affecting products from Canonical, Mozilla, Oracle, and Red Hat. This flaw allows remote attackers to perform distinguishing and plaintext-recovery attacks by analyzing timing data from crafted packets related to malformed CBC padding. With a CVSS score of 4.3 (Medium), exploitation requires medium attack complexity and could lead to partial confidentiality compromise. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage for this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.14.3CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
10.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:10.04:*:*:*:-:*:*:*
11.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:11.10:*:*:*:*:*:*:*
12.04CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:-:*:*:*
12.10CPE matchmatch criteria
cpe:2.3:o:canonical:ubuntu_linux:12.10:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

4.3MEDIUM

AV:N/AC:M/Au:N/C:P/I:N/A:N

Confidentiality Impact
PARTIAL
Integrity Impact
NONE
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
MEDIUM
Authentication
NONE
Exploitability Score
8.6
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
3.72%
Probability of exploitation in next 30 days
EPSS Percentile
88.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0372 is in the 84th percentile among its peer group of 19,954 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (7)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nspr-0:4.9.5-1.el5_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nss-0:3.14.3-6.el5_9
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nspr-0:4.9.5-2.el6_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss-0:3.14.3-4.el6_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss-softokn-0:3.14.3-3.el6_4
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss-util-0:3.14.3-3.el6_4
View patch
redhatpatch availablevia redhat_api
Product: RHEV 3.X Hypervisor and Agents for RHEL-6Fixed in: rhev-hypervisor6-0:6.4-20130815.0.el6_4
View patch

Vendor Advisories (1)

redhatCVE-2013-1620Moderate

nss: TLS CBC padding timing attack

Feb 4, 2013

References

kb.juniper.net / InfoCenter/index
Third Party Advisory
lists.opensuse.org / opensuse-security-announce/2013-04/msg00009.html
Broken Link
lists.opensuse.org / opensuse-security-announce/2013-04/msg00010.html
Broken Link
openwall.com / lists/oss-security/2013/02/05/24
Mailing ListThird Party Advisory
rhn.redhat.com / errata/RHSA-2013-1135.html
Third Party Advisory
rhn.redhat.com / errata/RHSA-2013-1144.html
Third Party Advisory
seclists.org / fulldisclosure/2014/Dec/23
Mailing ListThird Party Advisory
security.gentoo.org / glsa/glsa-201406-19.xml
Third Party Advisory
isg.rhul.ac.uk / tls/TLStiming.pdf
Technical DescriptionThird Party Advisory
oracle.com / technetwork/topics/security/cpuapr2014-1972952.html
Third Party Advisory
oracle.com / technetwork/topics/security/cpujan2014-1972949.html
Third Party Advisory
oracle.com / technetwork/topics/security/cpujan2015-1972971.html
Third Party Advisory
oracle.com / technetwork/topics/security/cpujul2014-1972956.html
Third Party Advisory
oracle.com / technetwork/topics/security/ovmbulletinjul2016-3090546.html
Third Party Advisory
securityfocus.com / archive/1/534161/100/0/threaded
Third Party AdvisoryVDB Entry
securityfocus.com / bid/57777
Third Party AdvisoryVDB Entry
securityfocus.com / bid/64758
Third Party AdvisoryVDB Entry
ubuntu.com / usn/USN-1763-1
Third Party Advisory
vmware.com / security/advisories/VMSA-2014-0012.html
Third Party Advisory