CVE-2023-45814Network attack vector

Token disclosure via stale AuthenticationService cache reuse

Published Oct 18, 2023 · Updated Sep 13, 2024

Use-after-free in Bunkum 4.0.0 through 4.2.0 allows remote attackers to access another user's token through crafted request sequences. The AuthenticationService retains its per-request IToken cache after a request ends, then dereferences IToken.User after Realm detaches an expired token. Triggering requires authenticated requests against limited endpoints that do not consume IToken or IUser, and the selected stale token is unpredictable.

CVSS severity5.3
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Bunkum 4.0.0 through 4.2.0 allows remote attackers to access another user's token through crafted request sequences. The AuthenticationService retains its per-request IToken cache after a request ends, then dereferences IToken.User after Realm detaches an expired token. Triggering requires authenticated requests against limited endpoints that do not consume IToken or IUser, and the selected stale token is unpredictable.

The record

CVE
CVE-2023-45814
Published
Oct 18, 2023
Updated
Sep 13, 2024
Vendor
PlanetBunkum
Product
Bunkum
Classifications
CWE-772, CAPEC-469
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 13, 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=>= 4.0.0, < 4.2.1
  2. Affected versionversion=4.0.0 <4.2.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

PlanetBunkum · Bunkumversion=>= 4.0.0, < 4.2.1; version=4.0.0 <4.2.1

Published CVSS scores

5.3NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
5.3GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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 exploitUnconfirmed

Weakness, pattern, technique

CWE-772Missing Release of Resource after Effective Lifetime
CAPEC-469HTTP DoS

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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