CVE-2023-37456Public exploitNetwork attack vector

Browser crash via unchecked session-restore parameter

Published Jul 12, 2023 · Updated Nov 7, 2024

Denial of service in Mozilla Firefox for iOS before 115 allows remote attackers to crash the browser through a malicious webpage. The SessionRestoreHelper WebKit message handler reads the missing params["name"] value without a guard instead of rejecting an empty message body. Any page loaded in the browser can invoke the exposed handler without authentication; the demonstrated consequence is a full browser crash, with no reported data access, code execution, or persistent device impact.

CVSS severityUnavailable
Unscored
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Mozilla Firefox for iOS before 115 allows remote attackers to crash the browser through a malicious webpage. The SessionRestoreHelper WebKit message handler reads the missing params["name"] value without a guard instead of rejecting an empty message body. Any page loaded in the browser can invoke the exposed handler without authentication; the demonstrated consequence is a full browser crash, with no reported data access, code execution, or persistent device impact.

The record

CVE
CVE-2023-37456
Published
Jul 12, 2023
Updated
Nov 7, 2024
Vendor
Mozilla
Product
Firefox for iOS
Classifications
Unavailable
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 12, 2023CVE publishedPublication date reported by the CVE source.
  2. Nov 7, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <115

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Mozilla · Firefox for iOSversion=unspecified <115

Published CVSS scores

No CVSS assessment is available in this record.

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo