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CVE-2018-18508

23
FAUCET Score

CVE-2018-18508 describes a Denial of Service vulnerability in Network Security Services (NSS) versions prior to 3.36.7 and 3.41.1, affecting products from Mozilla and Siemens. A remote attacker can trigger a crash via a malformed signature, leading to a null dereference. Rated Medium severity (CVSS 6.5), this vulnerability requires user interaction (UI:R) but has a high impact on availability (A:H). There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 3.36.7CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
>= 3.41, < 3.41.1CPE matchmatch criteria
cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
< 2.14.0CPE matchmatch criteria
cpe:2.3:o:siemens:ruggedcom_rox_mx5000_firmware:*:*:*:*:*:*:*:*
< 2.14.0CPE matchmatch criteria
cpe:2.3:o:siemens:ruggedcom_rox_rx1400_firmware:*:*:*:*:*:*:*:*
< 2.14.0CPE matchmatch criteria
cpe:2.3:o:siemens:ruggedcom_rox_rx1500_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.98%
Probability of exploitation in next 30 days
EPSS Percentile
78.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-25
Model: v2026.06.15
This CVE's current EPSS score of 0.0198 is in the 89th percentile among its peer group of 26,209 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (8)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: nspr-0:4.21.0-2.el8_0
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 8Fixed in: nss-0:3.44.0-7.el8_0
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 7Fixed 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-2018-18508Moderate

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

Jan 22, 2019

References

cert-portal.siemens.com / productcert/pdf/ssa-379803.pdf
Third Party Advisory
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.36.7_release_notes
Release NotesVendor Advisory
developer.mozilla.org / en-US/docs/Mozilla/Projects/NSS/NSS_3.41.1_release_notes
Release NotesVendor Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-040-04
Third Party AdvisoryUS Government Resource