CVE-2023-33950Network attack vector

Service interruption via backtracking redirect patterns

Published May 24, 2023 · Updated Oct 22, 2024

ReDoS in Liferay Portal and DXP Pattern Redirects allows remote attackers to exhaust server resources via crafted request URLs. Pattern Redirects evaluates configured regular-expression patterns against request URLs without preventing expressions with excessive backtracking. A vulnerable pattern must be configured and reached; matching a crafted URL then consumes excessive resources and interrupts service availability.

CVSS severity6.5
Medium
EPSS probability0.92%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

ReDoS in Liferay Portal and DXP Pattern Redirects allows remote attackers to exhaust server resources via crafted request URLs. Pattern Redirects evaluates configured regular-expression patterns against request URLs without preventing expressions with excessive backtracking. A vulnerable pattern must be configured and reached; matching a crafted URL then consumes excessive resources and interrupts service availability.

The record

CVE
CVE-2023-33950
Published
May 24, 2023
Updated
Oct 22, 2024
Vendor
Liferay
Product
Liferay Portal
Classifications
CWE-1333, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 24, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 22, 2024Record 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=7.4.3.48 <=7.4.3.76

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Liferay · Liferay Portalversion=7.4.3.48 <=7.4.3.76
Liferay · Liferay DXPversion=7.4.13.u48 <=7.4.13.u76

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
6.5Liferay Inc.CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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