A Null pointer dereference vulnerability exists in Mozilla Network Security Services due to a missing NULL check in PK11_SignWithSymKey / ss
A Null pointer dereference vulnerability exists in Mozilla Network Security Services due to a missing NULL check in PK11_SignWithSymKey / ssl3_ComputeRecordMACConstantTime, which could let a remote malicious user cause a Denial of Service.
- Published
- Nov 15, 2019
- Updated
- Jun 16, 2026
- EPSS
- 2.3% · 82th percentile
- CWE
- CWE-476
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.3%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| mozilla | nss | cpe:2.3:a:mozilla:nss |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| redhat | enterprise linux | cpe:2.3:o:redhat:enterprise_linux |
| suse | linux enterprise server | cpe:2.3:o:suse:linux_enterprise_server |
| avaya | aura application enablement services | cpe:2.3:a:avaya:aura_application_enablement_services |
| avaya | aura application server 5300 | cpe:2.3:a:avaya:aura_application_server_5300 |
| avaya | aura communication manager | cpe:2.3:a:avaya:aura_communication_manager |
| avaya | aura communication manager messagint | cpe:2.3:a:avaya:aura_communication_manager_messagint |
| avaya | breeze platform | cpe:2.3:a:avaya:breeze_platform |
| avaya | call management system | cpe:2.3:a:avaya:call_management_system |
| avaya | iq | cpe:2.3:a:avaya:iq |
| avaya | cs1000e firmware | cpe:2.3:o:avaya:cs1000e_firmware |
and 20 more
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- avaya aura application enablement services6.1 and later · up to 6.3.3 inclusive
- avaya aura application enablement services7.0
- avaya aura application server 53003.0
- avaya aura communication manager6.0 and later · up to 6.3.117.0 inclusive
- avaya aura communication manager7.0
- avaya aura communication manager messagint7.0
- avaya aura conferencing7.0
- avaya aura conferencing7.2
- avaya aura conferencing8.0
- avaya aura experience portal6.0 and later · up to 7.1 inclusive
- avaya aura messaging6.3
- avaya aura messaging6.3.3
- avaya aura session manager6.3 and later · up to 6.3.18 inclusive
- avaya aura session manager7.0
- avaya aura session manager7.0.1
- avaya aura system manager7.0 and later · up to 7.0.1.3 inclusive
- avaya aura system manager6.3 and later · up to 6.3.18 inclusive
- avaya aura system platform firmware6.3 and later · up to 6.4.0 inclusive
- avaya aura utility services7.0 and later · up to 7.0.1.2 inclusive
- avaya aura utility services6.3 and later · up to 6.3.14 inclusive
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 Network Security Services
- 3.24affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | nss | before 2:3.25-1 | 2:3.25-1 |
| Red Hat:enterprise_linux:5::client | nss | before 0:3.21.3-2.el5_11 | 0:3.21.3-2.el5_11 |
| Red Hat:enterprise_linux:5::client | nss-debuginfo | before 0:3.21.3-2.el5_11 | 0:3.21.3-2.el5_11 |
| Red Hat:enterprise_linux:5::client | nss-tools | before 0:3.21.3-2.el5_11 | 0:3.21.3-2.el5_11 |
| Red Hat:enterprise_linux:5::client_workstation | nss-devel | before 0:3.21.3-2.el5_11 | 0:3.21.3-2.el5_11 |
| Red Hat:enterprise_linux:5::client_workstation | nss-pkcs11-devel | before 0:3.21.3-2.el5_11 | 0:3.21.3-2.el5_11 |
| Red Hat:enterprise_linux:6::client | nss | before 0:3.21.3-2.el6_8 | 0:3.21.3-2.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-debuginfo | before 0:3.21.3-2.el6_8 | 0:3.21.3-2.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-devel | before 0:3.21.3-2.el6_8 | 0:3.21.3-2.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-pkcs11-devel | before 0:3.21.3-2.el6_8 | 0:3.21.3-2.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-sysinit | before 0:3.21.3-2.el6_8 | 0:3.21.3-2.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-tools | before 0:3.21.3-2.el6_8 | 0:3.21.3-2.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-util | before 0:3.21.3-1.el6_8 | 0:3.21.3-1.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-util-debuginfo | before 0:3.21.3-1.el6_8 | 0:3.21.3-1.el6_8 |
| Red Hat:enterprise_linux:6::client | nss-util-devel | before 0:3.21.3-1.el6_8 | 0:3.21.3-1.el6_8 |
| Red Hat:enterprise_linux:7::client | nss | before 0:3.21.3-2.el7_3 | 0:3.21.3-2.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-debuginfo | before 0:3.21.3-2.el7_3 | 0:3.21.3-2.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-devel | before 0:3.21.3-2.el7_3 | 0:3.21.3-2.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-pkcs11-devel | before 0:3.21.3-2.el7_3 | 0:3.21.3-2.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-sysinit | before 0:3.21.3-2.el7_3 | 0:3.21.3-2.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-tools | before 0:3.21.3-2.el7_3 | 0:3.21.3-2.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-util | before 0:3.21.3-1.1.el7_3 | 0:3.21.3-1.1.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-util-debuginfo | before 0:3.21.3-1.1.el7_3 | 0:3.21.3-1.1.el7_3 |
| Red Hat:enterprise_linux:7::client | nss-util-devel | before 0:3.21.3-1.1.el7_3 | 0:3.21.3-1.1.el7_3 |
+6
Same product
mozilla: all recordsOther highest-scoring records for the same primary product.
- CVE-2021-43527NSS (Network Security Services) versions prior to 3.73 or 3.68.1 ESR are vulnerable to a heap overflow when handling DER-encoded DSA or RSA-44Plan
- CVE-2020-12403A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55.36Monitor
- CVE-2016-1938The s_mp_div function in lib/freebl/mpi/mpi.c in Mozilla Network Security Services (NSS) before 3.21, as used in Mozilla Firefox before 44.027Monitor
- CVE-2023-4421The NSS code used for checking PKCS#1 v1.5 was leaking information useful in mounting Bleichenbacher-like attacks.26Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:nss | 2:3.25-1 · Debian:12 | Package registry (OSV) |
| red hat:nss | 0:3.21.3-2.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:nss-debuginfo | 0:3.21.3-2.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:nss-devel | 0:3.21.3-2.el5_11 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:nss-pkcs11-devel | 0:3.21.3-2.el5_11 · Red Hat:enterprise_linux:5::client_workstation | Package registry (OSV) |
| red hat:nss-sysinit | 0:3.21.3-2.el6_8 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-tools | 0:3.21.3-2.el5_11 · Red Hat:enterprise_linux:5::client | Package registry (OSV) |
| red hat:nss-util | 0:3.21.3-1.el6_8 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-util-debuginfo | 0:3.21.3-1.el6_8 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| red hat:nss-util-devel | 0:3.21.3-1.el6_8 · Red Hat:enterprise_linux:6::client | Package registry (OSV) |
| suse:mozilla-nss | 3.21.3-50.1 · SUSE:Linux Enterprise Desktop 12 SP1 | Package registry (OSV) |
| suse:MozillaFirefox | 45.5.0esr-88.1 · SUSE:Linux Enterprise Desktop 12 SP1 | Package 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.
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 researchersFinders, 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.
- No user action is required.
- 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
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/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 helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- lists.opensuse.org/opensuse-security-announce/2016-12/msg00011.html
- lists.opensuse.org/opensuse-security-announce/2016-12/msg00037.html
- lists.opensuse.org/opensuse-security-announce/2016-12/msg00049.html
- rhn.redhat.com/errata/RHSA-2016-2779.html
- www.securityfocus.com/bid/94349
- www.ubuntu.com/usn/USN-3163-1
- bto.bluecoat.com/security-advisory/sa137
- bugzilla.mozilla.org/show_bug.cgi?id=1306103
- security.gentoo.org/glsa/201701-46
Vendor advisories and official records. Exploit/PoC links are deliberately left out.