A flaw in DRBG number generation within the Network Security Services (NSS) library where the internal state V does not correctly carry bits
A flaw in DRBG number generation within the Network Security Services (NSS) library where the internal state V does not correctly carry bits over. The NSS library has been updated to fix this issue to address this issue and Firefox ESR 52.1 has been updated with NSS version 3.28.4. This vulnerability affects Thunderbird < 52.1, Firefox ESR < 45.9, Firefox ESR < 52.1, and Firefox < 53.
- Published
- Jun 11, 2018
- Updated
- Jun 16, 2026
- EPSS
- 2.6% · 85th percentile
- CWE
- CWE-682
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Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 21 / 40 · 5.3 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 2.6%
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
| mozilla | firefox | cpe:2.3:a:mozilla:firefox |
| mozilla | network security services | cpe:2.3:a:mozilla:network_security_services |
| mozilla | thunderbird | cpe:2.3:a:mozilla:thunderbird |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- debian debian linux8.0
- mozilla firefoxbefore 45.9.0
- mozilla firefoxbefore 53.0
- mozilla firefox52.0
- mozilla network security servicesbefore 3.28.4
- mozilla thunderbirdbefore 52.1.0
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 Firefox
- unspecified and later · before 53affected
Mozilla Firefox ESR
- unspecified and later · before 45.9affected
- unspecified and later · before 52.1affected
Mozilla Thunderbird
- unspecified and later · before 52.1affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Alpine:v3.3 | nss | before 3.23-r1 | 3.23-r1 |
| Debian:12 | firefox-esr | before 45.9.0esr-1 | 45.9.0esr-1 |
| Debian:12 | nss | before 2:3.26.2-1.1 | 2:3.26.2-1.1 |
| Debian:7 | nss | before 2:3.26-1+debu7u3 | 2:3.26-1+debu7u3 |
| Debian:8 | nss | before 2:3.26-1+debu8u2 | 2:3.26-1+debu8u2 |
Same product
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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 |
|---|---|---|
| alpine:nss | 3.23-r1 · Alpine:v3.3 | Package registry (OSV) |
| debian:firefox-esr | 45.9.0esr-1 · Debian:12 | Package registry (OSV) |
| debian:nss | 2:3.26.2-1.1 · Debian:12 | 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
- low · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- Low
- Availability impact
- None
Weakness class (CWE)
CWE-682 · Incorrect CalculationCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
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.
Attack patterns (CAPEC)
ATT&CK techniques
—
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
- www.securityfocus.com/bid/97940
- www.securitytracker.com/id/1038320
- bugzilla.mozilla.org/show_bug.cgi?id=1345089
- security.gentoo.org/glsa/201705-04
- www.debian.org/security/2017/dsa-3831
- www.debian.org/security/2017/dsa-3872
- www.mozilla.org/security/advisories/mfsa2017-10/
- www.mozilla.org/security/advisories/mfsa2017-11/
- www.mozilla.org/security/advisories/mfsa2017-12/
- www.mozilla.org/security/advisories/mfsa2017-13/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.