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CVE-2023-5173

HIGH
7.5
CVSS Score
Published: September 27, 2023 at 02:13 PM UTC
Updated: June 17, 2026 at 06:47 AM UTC
1 product affected across 1 vendorFirefox

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Severity
HIGH7.5
Exploit prediction
EPSS 0.9%

Description

In a non-standard configuration of Firefox, an integer overflow could have occurred based on network traffic (possibly under influence of a local unprivileged webpage), leading to an out-of-bounds write to privileged process memory. *This bug only affects Firefox if a non-standard preference allowing non-HTTPS Alternate Services (`network.http.altsvc.oe`) is enabled.* This vulnerability affects Firefox < 118.

Affected

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

Firefox· Mozilla
95%
v < 118
Affected range stops below 118, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Permissions Required
Source: [email protected]
https://bugzilla.mozilla.org/show_bug.cgi?id=1823172
Source: [email protected]
https://security.gentoo.org/glsa/202401-10
Vendor Advisory
Source: [email protected]
https://www.mozilla.org/security/advisories/mfsa2023-41/

CVSS

7.5HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
HIGH
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-190

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