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NVD / CVE Program· CNA mozilla

CVE-2023-5388: NSS was susceptible to a timing side-channel attack when performing RSA decryption.

Noroxi assessment

Priority: Monitor (action score 26/100)

  • 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: 0.97% (FIRST EPSS); higher than 61.7% of all records.
  • 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.
  • Fixed version: firefox (AlmaLinux:8) 115.9.1-1.el8_9.alma.1; nss (AlmaLinux:8) 3.90.0-4.el8_9; nss-devel (AlmaLinux:8) 3.90.0-4.el8_9.

Low priority for now. Upgrade to firefox (AlmaLinux:8) 115.9.1-1.el8_9.alma.1; nss (AlmaLinux:8) 3.90.0-4.el8_9; nss-devel (AlmaLinux:8) 3.90.0-4.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

NSS was susceptible to a timing side-channel attack when performing RSA decryption. This attack could potentially allow an attacker to recover the private data. This vulnerability affects Firefox < 124, Firefox ESR < 115.9, and Thunderbird < 115.9.

MediumCVSS 6.5 · v3.1—No exploit Fix available
Published
Mar 19, 2024
Updated
Jun 17, 2026
EPSS
0.9% · 61th percentile

Report tools

JSON

Action score

26

Monitor

Low priority for now.

CVSS
26 / 40 · 6.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.9%

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-2023-5388

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
mozillathunderbird
debiandebian linux

Affected versions

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

  • debian debian linux10.0
  • mozilla firefoxbefore 115.9.0
  • mozilla firefoxbefore 124.0
  • mozilla thunderbirdbefore 115.9.0

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 124affected

  • Mozilla Firefox ESR

    • unspecified and later · before 115.9affected

  • Mozilla Thunderbird

    • unspecified and later · before 115.9affected

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:8firefoxbefore 115.9.1-1.el8_9.alma.1115.9.1-1.el8_9.alma.1
AlmaLinux:8nssbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-develbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-softoknbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-softokn-develbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-softokn-freeblbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-softokn-freebl-develbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-sysinitbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-toolsbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-utilbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8nss-util-develbefore 3.90.0-4.el8_93.90.0-4.el8_9
AlmaLinux:8thunderbirdbefore 115.9.0-1.el8_9.alma.1115.9.0-1.el8_9.alma.1
AlmaLinux:9firefoxbefore 115.9.1-1.el9_3.alma.1115.9.1-1.el9_3.alma.1
AlmaLinux:9firefox-x11before 115.9.1-1.el9_3.alma.1115.9.1-1.el9_3.alma.1
AlmaLinux:9nsprbefore 4.35.0-4.el9_34.35.0-4.el9_3
AlmaLinux:9nspr-develbefore 4.35.0-4.el9_34.35.0-4.el9_3
AlmaLinux:9nssbefore 3.90.0-4.el9_33.90.0-4.el9_3
AlmaLinux:9nss-develbefore 3.90.0-4.el9_33.90.0-4.el9_3
AlmaLinux:9nss-softoknbefore 3.90.0-4.el9_33.90.0-4.el9_3
AlmaLinux:9nss-softokn-develbefore 3.90.0-4.el9_33.90.0-4.el9_3
AlmaLinux:9nss-softokn-freeblbefore 3.90.0-4.el9_33.90.0-4.el9_3
AlmaLinux:9nss-softokn-freebl-develbefore 3.90.0-4.el9_33.90.0-4.el9_3
AlmaLinux:9nss-sysinitbefore 3.90.0-4.el9_33.90.0-4.el9_3
AlmaLinux:9nss-toolsbefore 3.90.0-4.el9_33.90.0-4.el9_3

+96

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 befKEV
    94Now
  • CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV
    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 bypassKEV
    86Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-26282Feb 22, 2024 · Using an AMP url with a canonical element, an attacker could have executed JavaScript from an opened bookmarked page.
    28Monitor
  • ← EarlierCVE-2024-26283Feb 22, 2024 · An attacker could have executed unauthorized scripts on top origin sites using a JavaScript URI when opening an external URL with a custom F
    31Monitor
  • Later →CVE-2024-2605Mar 19, 2024 · An attacker could have leveraged the Windows Error Reporter to run arbitrary code on the system escaping the sandbox.
    23Monitor

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:nspr4.35.0-4.el9_3 · AlmaLinux:9Package registry (OSV)
almalinux:nspr-devel4.35.0-4.el9_3 · AlmaLinux:9Package registry (OSV)
almalinux:nss3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-devel3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn-devel3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn-freebl3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-softokn-freebl-devel3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-sysinit3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-tools3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-util3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
almalinux:nss-util-devel3.90.0-4.el8_9 · AlmaLinux:8Package registry (OSV)
alpine:nss3.98-r0 · Alpine:v3.19Package registry (OSV)
debian:firefox-esr115.9.0esr-1~deb12u1 · Debian:12Package registry (OSV)
debian:nss2:3.98-1 · Debian:13Package registry (OSV)
debian:thunderbird1:115.9.0-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:mozilla-nss3.101.2-150400.3.48.1 · openSUSE:Leap Micro 5.5Package registry (OSV)
opensuse:MozillaFirefox115.9.1-150200.152.131.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:MozillaThunderbird115.9.0-150200.8.154.1 · openSUSE:Leap 15.5Package registry (OSV)
red hat:nss0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-debuginfo0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-debugsource0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-devel0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-debuginfo0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-devel0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-freebl0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-freebl-debuginfo0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-softokn-freebl-devel0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)
red hat:nss-sysinit0:3.90.0-4.el8_8 · Red Hat:rhel_eus:8.8::appstreamPackage registry (OSV)

+9

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.

Variant candidates

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

  • CVE-2022-34477453 days apartThe MediaError message property should be consistent to avoid leaking information about cross-origin resources; however for a same-site cros
    30Monitor
  • CVE-2024-10463224 days apartVideo frames could have been leaked between origins in some situations.
    26Monitor
  • CVE-2023-25728291 days apartThe <code>Content-Security-Policy-Report-Only</code> header could allow an attacker to leak a child iframe's unredacted URI when interaction
    26Monitor
  • CVE-2023-25741291 days apartWhen dragging and dropping an image cross-origin, the image's size could potentially be leaked.
    26Monitor
  • CVE-2022-45403453 days apartService Workers should not be able to infer information about opaque cross-origin responses; but timing information for cross-origin media c
    26Monitor
  • CVE-2022-45416453 days apartKeyboard events reference strings like "KeyA" that were at fixed, known, and widely-spread addresses.
    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).

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

Weakness class (CWE)

CWE-203 · Observable Discrepancy

CVSS vector

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

nvd-secondary

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 (6 more)

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

All records