CVE-2023-1543Network attack vector

Administrative session reuse via uncleared logout cache

Published Mar 21, 2023 · Updated Feb 26, 2025

Insufficient session expiration in Apache Answer before 1.0.6 allows attackers with an administrator token to retain access after logout. UserLogout removes ordinary user cache data but fails to call RemoveAdminUserCacheInfo for the supplied access token, leaving the administrative cache valid. Exploitation requires a valid administrator access token and an administrator logout; the token remains usable for administrative requests.

CVSS severity8.8
High
EPSS probability0.78%
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

Insufficient session expiration in Apache Answer before 1.0.6 allows attackers with an administrator token to retain access after logout. UserLogout removes ordinary user cache data but fails to call RemoveAdminUserCacheInfo for the supplied access token, leaving the administrative cache valid. Exploitation requires a valid administrator access token and an administrator logout; the token remains usable for administrative requests.

The record

CVE
CVE-2023-1543
Published
Mar 21, 2023
Updated
Feb 26, 2025
Vendor
The Apache Software Foundation
Product
Apache Answer
Classifications
CWE-613, T1550.001
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 26, 2025Record 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 <1.0.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

The Apache Software Foundation · Apache Answerversion=unspecified <1.0.6

Published CVSS scores

8.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
6.8HuntrCVSS:3.0/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:H/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-613Insufficient Session Expiration
T1550.001Application Access Token

Public exploit references

No public exploit references are available in this record.

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