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CVE-2018-12404

44
FAUCET Score

CVE-2018-12404 describes a cached side-channel attack, a variant of the Bleichenbacher attack, affecting all NSS versions prior to 3.41. This vulnerability allows for the decryption of encrypted content during RSA encryption handshakes. With a CVSS score of 5.9 (Medium), it has a network attack vector and high confidentiality impact, but requires high attack complexity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.41CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.9MEDIUM

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
44.40%
Probability of exploitation in next 30 days
EPSS Percentile
98.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.4440 is in the 99th percentile among its peer group of 19,954 CVEs.

Social Chatter

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 (13)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nss-util-0:3.44.0-3.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Ansible Tower 3.4 for RHEL 7Fixed in: ansible-tower-34/ansible-tower-memcached:1.4.15-28
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Ansible Tower 3.4 for RHEL 7Fixed in: ansible-tower-35/ansible-tower-memcached:1.4.15-28
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Ansible Tower 3.4 for RHEL 7Fixed in: ansible-tower-37/ansible-tower-memcached-rhel7:1.4.15-28
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nspr-0:4.21.0-1.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nss-0:3.44.0-4.el7
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: nss-softokn-0:3.44.0-5.el7
View patch
mozillavendor investigatingvia nvd_reference
View patch
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 5Fixed in: nss
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: nss
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: mingw-nss
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: redhat-virtualization-host
redhatend of lifevia redhat_api
Product: Red Hat Virtualization 4Fixed in: rhvm-appliance

Vendor Advisories (1)

redhatCVE-2018-12404Moderate

nss: Cache side-channel variant of the Bleichenbacher attack

Nov 30, 2018

References

lists.opensuse.org / opensuse-security-announce/2019-07/msg00021.html
access.redhat.com / errata/RHSA-2019:2237
bugzilla.mozilla.org / show_bug.cgi
Issue TrackingVDB EntryVendor Advisory
cert-portal.siemens.com / productcert/pdf/ssa-379803.pdf
lists.debian.org / debian-lts-announce/2020/09/msg00029.html
us-cert.cisa.gov / ics/advisories/icsa-21-040-04
oracle.com / technetwork/security-advisory/cpuoct2019-5072832.html
securityfocus.com / bid/107260
Third Party AdvisoryVDB Entry