CVE-2023-37205Public exploitNetwork attack vector

URL spoofing via scheme-trimmed RTL rendering

Published Jul 5, 2023 · Updated Feb 13, 2025

URL spoofing in Mozilla Firefox before 115 allows remote attackers to misrepresent an HTTP origin by supplying a crafted RTL Arabic URL. BrowserUIUtils.trimURL() removes the HTTP scheme that otherwise anchors left-to-right display, allowing bidirectional rendering to reorder the Arabic host and path so a trusted-looking domain appears first. Exploitation requires a user to open attacker-controlled content, and the effect is limited to misleading the address-bar origin rather than changing the page's actual origin.

CVSS severity6.5
Medium
EPSS probability0.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

URL spoofing in Mozilla Firefox before 115 allows remote attackers to misrepresent an HTTP origin by supplying a crafted RTL Arabic URL. BrowserUIUtils.trimURL() removes the HTTP scheme that otherwise anchors left-to-right display, allowing bidirectional rendering to reorder the Arabic host and path so a trusted-looking domain appears first. Exploitation requires a user to open attacker-controlled content, and the effect is limited to misleading the address-bar origin rather than changing the page's actual origin.

The record

CVE
CVE-2023-37205
Published
Jul 5, 2023
Updated
Feb 13, 2025
Vendor
Mozilla
Product
Firefox
Classifications
T1204.001, T1036
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 5, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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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 · Firefoxversion=unspecified <115

Published CVSS scores

6.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1204.001User Execution: Malicious Link
T1036Masquerading

Public exploit references

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

Technologies

Your stack

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Your stack

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