Observable discrepancy in Mozilla Firefox
Priority LOW 31CWE-203Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Low · None · Low
- Fix status
- Partial Red Hat: 18 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-203.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00974 62nd percentileScored 2026-11-07
Fix Partial Firefox (Mozilla): 124Firefox ESR (Mozilla): 115.9+1 more productRed Hat: 23 advisoriesRed Hat: 18 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Mozilla | Firefox | before 124 | 124 | Patch available | CNA |
| Mozilla | Firefox ESR | before 115.9 | 115.9 | Patch available | CNA |
| Mozilla | Thunderbird | before 115.9 | 115.9 | Patch available | CNA |
- Firefox VendorMozilla Affected before 124 Fixed in 124 Patch available CNA
- Firefox ESR VendorMozilla Affected before 115.9 Fixed in 115.9 Patch available CNA
- Thunderbird VendorMozilla Affected before 115.9 Fixed in 115.9 Patch available CNA
CPE configurations NVD · 4
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* | before 115.9.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* | before 124.0 | Vulnerable | Mozilla |
| cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* | before 115.9.0 | Vulnerable | Mozilla |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* Versions before 115.9.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:* Versions before 124.0 Vulnerable ·Mozilla
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 115.9.0 Vulnerable ·Mozilla
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
Remediation
- Fix · CNA Firefox (Mozilla) Fixed in 124
- Fix · CNA Firefox ESR (Mozilla) Fixed in 115.9
- Fix · CNA Thunderbird (Mozilla) Fixed in 115.9
Red Hat 23 advisories
- RHSA-2024:1486 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-115.9.1-1.el7_9
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-115.9.1-1.el7_9
- Red Hat Enterprise Linux Server (v. 7) firefox-115.9.1-1.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-115.9.1-1.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) firefox-115.9.1-1.el7_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-115.9.1-1.el7_9
- RHSA-2024:1496 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.8.8) thunderbird-115.9.0-1.el8_8
- RHSA-2024:1497 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) thunderbird-115.9.0-1.el8_6
Show 20 more Red Hat advisories
- RHSA-2024:1500 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) thunderbird-115.9.0-1.el8_2
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) thunderbird-115.9.0-1.el8_2
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) thunderbird-115.9.0-1.el8_2
- RHSA-2024:1498 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-115.9.0-1.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-115.9.0-1.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-115.9.0-1.el7_9
- RHSA-2024:1494 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-115.9.0-1.el8_9
- RHSA-2024:1492 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.9.2) thunderbird-115.9.0-1.el9_2
- RHSA-2024:1493 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream (v. 9) thunderbird-115.9.0-1.el9_3
- RHSA-2024:1495 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.9.0) thunderbird-115.9.0-1.el9_0
- RHSA-2024:1499 Released 2024-03-25 · Red Hat rating Moderatethunderbird security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) thunderbird-115.9.0-1.el8_4
- Red Hat Enterprise Linux AppStream E4S (v.8.4) thunderbird-115.9.0-1.el8_4
- Red Hat Enterprise Linux AppStream TUS (v.8.4) thunderbird-115.9.0-1.el8_4
- RHSA-2024:1489 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox-115.9.1-1.el8_6
- RHSA-2024:1488 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox-115.9.1-1.el8_8
- RHSA-2024:1487 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox-115.9.1-1.el9_0
- RHSA-2024:1491 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox-115.9.1-1.el8_4
- Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox-115.9.1-1.el8_4
- Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox-115.9.1-1.el8_4
- RHSA-2024:1490 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox-115.9.1-1.el8_2
- Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox-115.9.1-1.el8_2
- Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox-115.9.1-1.el8_2
- RHSA-2024:1484 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-115.9.1-1.el8_9
- RHSA-2024:1485 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream (v. 9) firefox-115.9.1-1.el9_3, firefox-x11-115.9.1-1.el9_3
- RHSA-2024:1483 Released 2024-03-25 · Red Hat rating Criticalfirefox security update
- Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox-115.9.1-1.el9_2, firefox-x11-115.9.1-1.el9_2
- RHSA-2024:0108 Released 2024-01-10 · Red Hat rating Moderatenss security update
- Red Hat Enterprise Linux AppStream (v. 9) nspr-4.35.0-4.el9_3, nspr-devel-4.35.0-4.el9_3, nss-3.90.0-4.el9_3 +9
- RHSA-2024:0105 Released 2024-01-10 · Red Hat rating Moderatenss security update
- Red Hat Enterprise Linux AppStream (v. 8) nss-3.90.0-4.el8_9, nss-devel-3.90.0-4.el8_9, nss-softokn-3.90.0-4.el8_9 +7
- RHSA-2024:0107 Released 2024-01-10 · Red Hat rating Moderatenss security update
- Red Hat Enterprise Linux AppStream EUS (v.9.2) nspr-4.35.0-4.el9_2, nspr-devel-4.35.0-4.el9_2, nss-3.90.0-4.el9_2 +9
- RHSA-2024:0106 Released 2024-01-10 · Red Hat rating Moderatenss security update
- Red Hat Enterprise Linux AppStream EUS (v.8.6) nss-3.79.0-12.el8_6, nss-devel-3.79.0-12.el8_6, nss-softokn-3.79.0-12.el8_6 +7
- RHSA-2024:0093 Released 2024-01-09 · Red Hat rating Moderatenss security update
- Red Hat Enterprise Linux AppStream EUS (v.8.8) nss-3.90.0-4.el8_8, nss-devel-3.90.0-4.el8_8, nss-softokn-3.90.0-4.el8_8 +7
Fixed in the same release
Records fixed by the same vendor advisory or release, as the CNA lists them.
- Release ·
Mozilla Firefox 124
12 records Highest priority Priority MEDIUM 2 MEDIUM, 10 LOW
Other records, highest priority first
- TI-2024-02432 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 44
- TI-2024-02431 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 42
- TI-2024-02430 Clickjacking in Mozilla FirefoxPriority LOW 39
- Release ·
Mozilla Firefox ESR, Thunderbird 115.9
9 records Highest priority Priority MEDIUM 1 MEDIUM, 8 LOW
Other records, highest priority first
- TI-2024-02431 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 42
- TI-2024-02429 Use after free in Mozilla FirefoxPriority LOW 39
- TI-2024-02425 `AppendEncodedAttributeValue(), ExtraSpaceNeededForAttrEncoding()` and…Priority LOW 39
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux AppStream (v. 8) | Fixed | RHSA-2024:0105, RHSA-2024:1484, RHSA-2024:1494 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2024:0108, RHSA-2024:1485, RHSA-2024:1493 |
| Red Hat Enterprise Linux AppStream AUS (v. 8.2) | Fixed | RHSA-2024:1490, RHSA-2024:1500 |
| Red Hat Enterprise Linux AppStream AUS (v.8.4) | Fixed | RHSA-2024:1491, RHSA-2024:1499 |
| Red Hat Enterprise Linux AppStream E4S (v. 8.2) | Fixed | RHSA-2024:1490, RHSA-2024:1500 |
| Red Hat Enterprise Linux AppStream E4S (v.8.4) | Fixed | RHSA-2024:1491, RHSA-2024:1499 |
| Red Hat Enterprise Linux AppStream EUS (v.8.6) | Fixed | RHSA-2024:0106, RHSA-2024:1489, RHSA-2024:1497 |
| Red Hat Enterprise Linux AppStream EUS (v.8.8) | Fixed | RHSA-2024:0093, RHSA-2024:1488, RHSA-2024:1496 |
| Red Hat Enterprise Linux AppStream EUS (v.9.0) | Fixed | RHSA-2024:1487, RHSA-2024:1495 |
| Red Hat Enterprise Linux AppStream EUS (v.9.2) | Fixed | RHSA-2024:0107, RHSA-2024:1483, RHSA-2024:1492 |
| Red Hat Enterprise Linux AppStream TUS (v. 8.2) | Fixed | RHSA-2024:1490, RHSA-2024:1500 |
| Red Hat Enterprise Linux AppStream TUS (v.8.4) | Fixed | RHSA-2024:1491, RHSA-2024:1499 |
| Red Hat Enterprise Linux Client (v. 7) | Fixed | RHSA-2024:1486, RHSA-2024:1498 |
| Red Hat Enterprise Linux Client Optional (v. 7) | Fixed | RHSA-2024:1486 |
| Red Hat Enterprise Linux Server (v. 7) | Fixed | RHSA-2024:1486 |
| Red Hat Enterprise Linux Server Optional (v. 7) | Fixed | RHSA-2024:1486, RHSA-2024:1498 |
| Red Hat Enterprise Linux Workstation (v. 7) | Fixed | RHSA-2024:1486, RHSA-2024:1498 |
| Red Hat Enterprise Linux Workstation Optional (v. 7) | Fixed | RHSA-2024:1486 |
Timeline
- 2026-10-02 Threatist record created from CVE-2023-5388
- 2026-10-03 Alias added: GHSA-g2hf-9hjx-2rxj
References
Advisory 6
- https://bugzilla.mozilla.org/show_bug.cgi?id=1780432
- https://www.mozilla.org/security/advisories/mfsa2024-12/
- https://www.mozilla.org/security/advisories/mfsa2024-13/
- https://www.mozilla.org/security/advisories/mfsa2024-14/
- https://lists.debian.org/debian-lts-announce/2024/03/msg00022.html
- https://lists.debian.org/debian-lts-announce/2024/03/msg00028.html
More Mozilla Firefox vulnerabilities
- TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
- TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
- TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
- TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
- TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
- TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
Sources
- CVE-2023-5388 · CVE Program
- CVE-2023-5388 · NVD
- FIRST EPSS
- GHSA-g2hf-9hjx-2rxj · GitHub Advisory Database · CC BY 4.0
- CVE-2023-5388 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences