CVE-2023-41080Public exploitNetwork attack vector

Open redirect via protocol-relative saved request

Published Aug 25, 2023 · Updated Oct 29, 2025

Open redirect in Apache Tomcat allows remote attackers to send users to attacker-chosen sites through crafted FORM-authentication URLs. FormAuthenticator.savedRequestURL returns a saved request path beginning with multiple slashes, which browsers interpret as a protocol-relative URL. The ROOT web application must use FORM authentication, and user interaction is required; successful exploitation redirects the user without compromising the server.

CVSS severity6.1
Medium
EPSS probability6.05%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Open redirect in Apache Tomcat allows remote attackers to send users to attacker-chosen sites through crafted FORM-authentication URLs. FormAuthenticator.savedRequestURL returns a saved request path beginning with multiple slashes, which browsers interpret as a protocol-relative URL. The ROOT web application must use FORM authentication, and user interaction is required; successful exploitation redirects the user without compromising the server.

The record

CVE
CVE-2023-41080
Published
Aug 25, 2023
Updated
Oct 29, 2025
Vendor
The Apache Software Foundation
Product
Apache Tomcat
Classifications
CWE-601
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 25, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 29, 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=10.1.0-M1 <=10.0.12
  2. Affected versionversion=11.0.0-M1 <=11.0.0-M10
  3. Affected versionversion=8.5.0 <=8.5.92
  4. Affected versionversion=9.0.0-M1 <=9.0.79

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Apache Software Foundation · Apache Tomcatversion=10.1.0-M1 <=10.0.12; version=11.0.0-M1 <=11.0.0-M10; version=8.5.0 <=8.5.92; version=9.0.0-M1 <=9.0.79

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/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.

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

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

CWE-601URL Redirection to Untrusted Site ('Open Redirect')

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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