CVE-2018-18508

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.

Published: 2020-10-22 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-18508 is rated Moderate Risk (54.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.96%). EPSS rose +1.52% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-18508

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.43% 1.96% +1.52%
2 2026-05-08 0.56% 0.43% -0.12%
3 2026-01-11 — 0.56% —

Full EPSS history (14 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-18508

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.5 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.8 3.6 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2018-18508

OS Trackers for CVE-2018-18508

vendor priority summary link
debian not yet assigned CVE-2018-18508 not yet assigned priority: Debian including 1 source packages (nss), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-18508
gentoo normal CVE-2018-18508: 1 GLSA(s) (202003-37), 1 atom(s) (dev-libs/nss); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-18508
redhat medium — https://access.redhat.com/security/cve/CVE-2018-18508
suse medium CVE-2018-18508 severity moderate: SUSE including 478 source package names (1.1.1.0.1.5.102:libfreebl3-3.47.1-3.22.1, 1.1.1.0.1.5.102:libsoftokn3-3.47.1-3.22.1, …), 1011 product×package rows across 304 product lines (Container bci/bci-sle15-kernel-module-devel, Container bci/kiwi, … (304 product lines)): Fixed 709, Known Affected 157, Known Not Affected 145. https://www.suse.com/security/cve/CVE-2018-18508/
ubuntu medium CVE-2018-18508 medium priority: Ubuntu including 1 source packages (nss), 5 status rows across 5 suites (bionic, cosmic, trusty, upstream, xenial): released 5. https://ubuntu.com/security/CVE-2018-18508

Affected software / configurations for CVE-2018-18508

Vendor Product Version Raw CPE
mozilla network_security_services < 3.36.7 cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
mozilla network_security_services >= 3.41, < 3.41.1 cpe:2.3:a:mozilla:network_security_services:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_mx5000_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_mx5000_firmware:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_rx1400_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_rx1400_firmware:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_rx1500_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_rx1500_firmware:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_rx1501_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_rx1501_firmware:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_rx1510_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_rx1510_firmware:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_rx1511_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_rx1511_firmware:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_rx1512_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_rx1512_firmware:*:*:*:*:*:*:*:*
siemens ruggedcom_rox_rx5000_firmware < 2.14.0 cpe:2.3:o:siemens:ruggedcom_rox_rx5000_firmware:*:*:*:*:*:*:*:*

References for CVE-2018-18508

cvelogic Threat Intelligence