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CVE-2023-5388

MEDIUM
6.5
CVSS Score
Published: March 19, 2024 at 12:02 PM UTC
Updated: June 17, 2026 at 06:48 AM UTC
4 products affected across 2 vendorsDebian LinuxFirefoxThunderbird

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Severity
MEDIUM6.5
Exploit prediction
EPSS 1.0%
SSVC
No known exploit

Description

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Debian Linux· Debiandrupal
95%
10.0
Firefox· Mozilla
95%
v < 115.9.0v < 124v < 124.0
Affected range stops below 115.9.0, so it looks safe — our inference, not a vendor statement
Affected range stops below 124, so it looks safe — our inference, not a vendor statement
Affected range stops below 124.0, so it looks safe — our inference, not a vendor statement
Thunderbird· Mozilla
95%
v < 115.9v < 115.9.0
Affected range stops below 115.9, so it looks safe — our inference, not a vendor statement
Affected range stops below 115.9.0, so it looks safe — our inference, not a vendor statement
Firefox ESR· Mozilla
60%
v < 115.9
Affected range stops below 115.9, so it looks safe — our inference, not a vendor statement

References (7)

Issue TrackingVendor Advisory
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1780432
Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
Mailing ListThird Party Advisory
Source: [email protected]
https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-12/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-13/
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2024-14/
Source: af854a3a-2127-422b-91ae-364da2661108
https://lists.debian.org/debian-lts-announce/2024/03/msg00010.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

6.5MEDIUMCISA-ADP
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
LOW
Integrity
NONE
Availability
LOW
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-203

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