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CVE-2018-18508· NVD / CVE Program· CNA mozilla

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, resul

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.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Oct 22, 2020
Updated
Jun 16, 2026
EPSS
2.0% · 80th percentile
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Report tools

JSON

Action score

27

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.0%

Affected systems

VendorProduct
mozillanetwork security services
siemensruggedcom rox mx5000 firmware
siemensruggedcom rox mx5000
siemensruggedcom rox rx1400 firmware
siemensruggedcom rox rx1400
siemensruggedcom rox rx1500 firmware
siemensruggedcom rox rx1500
siemensruggedcom rox rx1501 firmware
siemensruggedcom rox rx1501
siemensruggedcom rox rx1510 firmware
siemensruggedcom rox rx1510
siemensruggedcom rox rx1511 firmware

and 5 more

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • mozilla network security servicesbefore 3.36.7
  • mozilla network security services3.41 and later · before 3.41.1
  • siemens ruggedcom rox mx5000 firmwarebefore 2.14.0
  • siemens ruggedcom rox rx1400 firmwarebefore 2.14.0
  • siemens ruggedcom rox rx1500 firmwarebefore 2.14.0
  • siemens ruggedcom rox rx1501 firmwarebefore 2.14.0
  • siemens ruggedcom rox rx1510 firmwarebefore 2.14.0
  • siemens ruggedcom rox rx1511 firmwarebefore 2.14.0
  • siemens ruggedcom rox rx1512 firmwarebefore 2.14.0
  • siemens ruggedcom rox rx5000 firmwarebefore 2.14.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.

  • Mozilla NSS

    • unspecified and later · before 3.41.1affected
    • unspecified and later · before 3.36.7affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12nssbefore 2:3.42.1-12:3.42.1-1
Debian:8nssbefore 2:3.26-1+debu8u42:3.26-1+debu8u4
Debian:9nssbefore 2:3.26.2-1.1+deb9u22:3.26.2-1.1+deb9u2
openSUSE:Leap 15.1mozilla-nsprbefore 4.23-lp151.2.6.14.23-lp151.2.6.1
openSUSE:Leap 15.1mozilla-nssbefore 3.47.1-lp151.2.9.13.47.1-lp151.2.9.1
Red Hat:enterprise_linux:8::appstreamnsprbefore 0:4.21.0-2.el8_00:4.21.0-2.el8_0
Red Hat:enterprise_linux:8::appstreamnspr-debuginfobefore 0:4.21.0-2.el8_00:4.21.0-2.el8_0
Red Hat:enterprise_linux:8::appstreamnspr-debugsourcebefore 0:4.21.0-2.el8_00:4.21.0-2.el8_0
Red Hat:enterprise_linux:8::appstreamnspr-develbefore 0:4.21.0-2.el8_00:4.21.0-2.el8_0
Red Hat:enterprise_linux:8::appstreamnssbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-debuginfobefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-debugsourcebefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-develbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-softoknbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-softokn-debuginfobefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-softokn-develbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-softokn-freeblbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-softokn-freebl-debuginfobefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-softokn-freebl-develbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-sysinitbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-sysinit-debuginfobefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-toolsbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-tools-debuginfobefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0
Red Hat:enterprise_linux:8::appstreamnss-utilbefore 0:3.44.0-7.el8_00:3.44.0-7.el8_0

+4

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2017-5461Mozilla Network Security Services (NSS) before 3.21.4, 3.22.x through 3.28.x before 3.28.4, 3.29.x before 3.29.5, and 3.30.x before 3.30.1 a
    40Plan
  • CVE-2009-2404Heap-based buffer overflow in a regular-expression parser in Mozilla Network Security Services (NSS) before 3.12.3, as used in Firefox, Thun
    38Monitor
  • CVE-2018-12404A cached side channel attack during handshakes using RSA encryption could allow for the decryption of encrypted content.
    36Monitor
  • CVE-2016-2834Mozilla Network Security Services (NSS) before 3.23, as used in Mozilla Firefox before 47.0, allows remote attackers to cause a denial of se
    36Monitor
  • CVE-2016-1950Heap-based buffer overflow in Mozilla Network Security Services (NSS) before 3.19.2.3 and 3.20.x and 3.21.x before 3.21.1, as used in Mozill
    36Monitor
  • CVE-2015-7181The sec_asn1d_parse_leaf function in Mozilla Network Security Services (NSS) before 3.19.2.1 and 3.20.x before 3.20.1, as used in Firefox be
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:nss2:3.42.1-1 · Debian:12Package registry (OSV)
opensuse:mozilla-nspr4.23-lp151.2.6.1 · openSUSE:Leap 15.1Package registry (OSV)
opensuse:mozilla-nss3.47.1-lp151.2.9.1 · openSUSE:Leap 15.1Package registry (OSV)
red hat:nspr0:4.21.0-2.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nspr-debuginfo0:4.21.0-2.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nspr-debugsource0:4.21.0-2.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nspr-devel0:4.21.0-2.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss-debuginfo0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss-debugsource0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss-devel0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss-softokn0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss-softokn-debuginfo0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss-softokn-devel0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
red hat:nss-softokn-freebl0:3.44.0-7.el8_0 · Red Hat:enterprise_linux:8::appstreamPackage registry (OSV)
suse:mozilla-nspr4.23-3.9.1 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)
suse:mozilla-nss3.47.1-3.22.1 · SUSE:Linux Enterprise Module for Basesystem 15Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-476 · NULL Pointer Dereference

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.

We use this product, ask for help

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records