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NVD / CVE Program· CNA mozilla

CVE-2023-6135: Multiple NSS NIST curves were susceptible to a side-channel attack known as "Minerva".

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.71% (FIRST EPSS); higher than 53.9% of all records.
  • 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.
  • Fixed version: nss (AlmaLinux:8) 3.90.0-6.el8_9; nss-devel (AlmaLinux:8) 3.90.0-6.el8_9; nss-softokn (AlmaLinux:8) 3.90.0-6.el8_9.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to nss (AlmaLinux:8) 3.90.0-6.el8_9; nss-devel (AlmaLinux:8) 3.90.0-6.el8_9; nss-softokn (AlmaLinux:8) 3.90.0-6.el8_9 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Multiple NSS NIST curves were susceptible to a side-channel attack known as "Minerva". This attack could potentially allow an attacker to recover the private key. This vulnerability affects Firefox < 121.

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
Dec 19, 2023
Updated
Jun 17, 2026
EPSS
0.7% · 53th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.7%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-6135

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
mozillafirefox

Affected versions

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

  • mozilla firefoxbefore 121.0

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 121affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8nssbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-develbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-softoknbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-softokn-develbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-softokn-freeblbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-softokn-freebl-develbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-sysinitbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-toolsbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-utilbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:8nss-util-develbefore 3.90.0-6.el8_93.90.0-6.el8_9
AlmaLinux:9nsprbefore 4.35.0-6.el9_34.35.0-6.el9_3
AlmaLinux:9nspr-develbefore 4.35.0-6.el9_34.35.0-6.el9_3
AlmaLinux:9nssbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-develbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-softoknbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-softokn-develbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-softokn-freeblbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-softokn-freebl-develbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-sysinitbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-toolsbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-utilbefore 3.90.0-6.el9_33.90.0-6.el9_3
AlmaLinux:9nss-util-develbefore 3.90.0-6.el9_33.90.0-6.el9_3
Debian:12nssfrom 0—
Debian:13nssbefore 2:3.95-12:3.95-1

+76

Same product

mozilla: all records

Other highest-scoring records for the same primary product.

  • CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x…KEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the…KEV
    87Now
  • CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to…KEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2023-6212Nov 21, 2023 · Memory safety bugs present in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4.
    35Monitor
  • ← EarlierCVE-2023-6213Nov 21, 2023 · Memory safety bugs present in Firefox 119.
    35Monitor
  • Later →CVE-2023-6856Dec 19, 2023 · The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver.
    41Plan

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
almalinux:nspr4.35.0-6.el9_3 · AlmaLinux:9Package registry (OSV)
almalinux:nspr-devel4.35.0-6.el9_3 · AlmaLinux:9Package registry (OSV)
almalinux:nss3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-devel3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn-devel3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn-freebl3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn-freebl-devel3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-sysinit3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-tools3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-util3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-util-devel3.90.0-6.el8_9 · AlmaLinux:8Package registry (OSV)
debian:nss2:3.95-1 · Debian:13Package registry (OSV)
opensuse:MozillaFirefox121.0-1.1 · openSUSE:TumbleweedPackage registry (OSV)
red hat:nss0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-debuginfo0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-debugsource0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-devel0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-debuginfo0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-devel0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-freebl0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-freebl-debuginfo0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-freebl-devel0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-sysinit0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-sysinit-debuginfo0:3.90.0-6.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
rocky linux:nss0:3.90.0-6.el8_9 · Rocky Linux:8Package 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.

No history yet (it accumulates with the daily EPSS job).

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.

Variant candidates

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

  • CVE-2022-34477362 days apartThe MediaError message property should be consistent to avoid leaking information about cross-origin resources; however for a same-site…
    30Monitor
  • CVE-2023-538891 days apartNSS was susceptible to a timing side-channel attack when performing RSA decryption.
    26Monitor
  • CVE-2023-25728200 days apartThe <code>Content-Security-Policy-Report-Only</code> header could allow an attacker to leak a child iframe's unredacted URI when…
    26Monitor
  • CVE-2023-25741200 days apartWhen dragging and dropping an image cross-origin, the image's size could potentially be leaked.
    26Monitor
  • CVE-2024-10463315 days apartVideo frames could have been leaked between origins in some situations.
    26Monitor
  • CVE-2022-31742362 days apartAn attacker could have exploited a timing attack by sending a large number of allowCredential entries and detecting the difference between…
    26Monitor

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).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

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
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-203 · Observable Discrepancy

CVSS vector

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

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

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

References

Show all references (2 more)

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

All records