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No exploitation reportedFix available

CVE-2023-5388

No exploitation reported by the sources we read.

  • Published2024-03-19
  • Fixed in124.0 · 115.9.0
  • WeaknessCWE-203

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2024-03-1912:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-5388?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-5388?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Mozilla firefox
BranchAffectedFixed in
124.0< 124.0124.0
115.9< 115.9.0115.9.0
Debian debian linux
BranchAffectedFixed in
10.0= 10.0no fix published
Mozilla thunderbird
BranchAffectedFixed in
115.9< 115.9.0115.9.0

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • firefoxAlmaLinux:9all versions · fixed in 115.9.1-1.el9_3.alma.1and 1 other package
  • firefoxAlmaLinux:8all versions · fixed in 115.9.1-1.el8_9.alma.1
  • nsprAlmaLinux:9all versions · fixed in 4.35.0-4.el9_3and 1 other package
  • nssAlmaLinux:9all versions · fixed in 3.90.0-4.el9_3and 9 other packages
  • nssAlmaLinux:8all versions · fixed in 3.90.0-4.el8_9and 9 other packages
  • thunderbirdAlmaLinux:9all versions · fixed in 115.9.0-1.el9_3.alma.1
  • thunderbirdAlmaLinux:8all versions · fixed in 115.9.0-1.el8_9.alma.1

Full record on NVD

Fix

  1. Update Mozilla firefox to 124.0 · 115.9.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub

Sources

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
Published
2024-03-19
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2023-5388?

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.

Is CVE-2023-5388 actively exploited?

Active exploitation of CVE-2023-5388 has not been confirmed. Its EPSS score was 1.0% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-5388?

CVE-2023-5388 has a CVSS v3 base score of 6.5 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L.

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