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Fencer Intel
medium 6.5

CVE-2018-18508 json

In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash due to a null dereference, resu…

published 2020-10-22 6 y ago modified 2026-06-17 4 mo ago also EUVD-2018-10233

cvss
6.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.0%
EPSS 2.0% chance of exploitation in 30 days, percentile 80%
public exploits
0
none known

Summary

In Network Security Services (NSS) before 3.36.7 and before 3.41.1, a malformed signature can cause a crash due to a null dereference, resulting in a Denial of Service.

Patch / fix

  • Mozilla NSS 3.36.7, 3.41.1
  • nss Debian 14, Debian 13, Debian 12 2:3.42.1-1

debian advisories DEBIAN-CVE-2018-18508

  • nss Ubuntu 14.04 LTS 2:3.28.4-0ubuntu0.14.04.5
  • nss Ubuntu 16.04 LTS 2:3.28.4-0ubuntu0.16.04.5
  • nss Ubuntu 18.04 LTS 2:3.35-2ubuntu2.2

ubuntu advisories UBUNTU-CVE-2018-18508

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • nss RHEL 8 3.44.0-7.el8_0
  • nspr RHEL 8 4.21.0-2.el8_0
  • nss-util RHEL 8 3.44.0-7.el8_0
  • nss-tools RHEL 8 3.44.0-7.el8_0
  • nss-softokn RHEL 8 3.44.0-7.el8_0
  • nss-sysinit RHEL 8 3.44.0-7.el8_0
  • nss-softokn-freebl RHEL 8 3.44.0-7.el8_0

red hat advisories RHSA-2019:1951

  • mozilla-nss SLE Module for Server Applications 15 SP1, SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 3.47.1-3.22.1
  • mozilla-nspr SLE Module for Basesystem 15 SP1, SLE Module for Basesystem 15 4.23-3.9.1

suse advisories SUSE-SU-2019:3395-1

  • mozilla-nss openSUSE Leap 15.1 3.47.1-lp151.2.9.1
  • mozilla-nspr openSUSE Leap 15.1 4.23-lp151.2.6.1

opensuse advisories openSUSE-SU-2020:0008-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2018-18508 updated cvss 6.5

nss: NULL pointer dereference in several CMS functions resulting in a denial of service

  • Red Hat Enterprise Linux 5 nss Red Hat Enterprise Linux 6 nss, nss-tools, nss-sysinit Red Hat Enterprise Linux 7 nss, nss-tools, nss-sysinit Red Hat Enterprise Linux 8 mingw-nss, mingw32-nss, mingw64-nss Red Hat Virtualization 4 rhvm-appliance, redhat-virtualization-host-image-update
    affected: workaround, no fix planned “This issue only affects applications compiled against NSS which use CMS (Cryptographic Message Syntax) API. Other applications are not affected.”
  • Red Hat Enterprise Linux AppStream (v. 8) nss 3.44.0-7.el8_0, nspr 4.21.0-2.el8_0, nss-util 3.44.0-7.el8_0, nss-tools 3.44.0-7.el8_0, nss-softokn 3.44.0-7.el8_0, nss-sysinit 3.44.0-7.el8_0, +1 more
    fixed: vendor fix “This issue only affects applications compiled against NSS which use CMS (Cryptographic Message Syntax) API. Other applications are not affected.” RHSA-2019:1951

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

cisa ICSA-21-040-04 updated cvss 6.5

Siemens RUGGEDCOM ROX II

  • Siemens RUGGEDCOM ROX MX5000 <V2.14.0 Siemens RUGGEDCOM ROX RX1400 <V2.14.0 Siemens RUGGEDCOM ROX RX1500 <V2.14.0 Siemens RUGGEDCOM ROX RX1501 <V2.14.0 Siemens RUGGEDCOM ROX RX1510 <V2.14.0 Siemens RUGGEDCOM ROX RX1511 <V2.14.0
    +2 more products
    Siemens RUGGEDCOM ROX RX1512 <V2.14.0 Siemens RUGGEDCOM ROX RX5000 <V2.14.0
    affected: fixed in V2.14.0, mitigation

Facts from CISA's republication of the vendor's own advisory (CSAF); the linked advisory is the authoritative source. CISA notification · csaf

Exploit prediction

1.97% chance of exploitation in the next 30 days, higher than 80% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected products

  • Mozilla NSS

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.