CVE-2023-51309Public exploitNetwork attack vector

Email service disruption via unthrottled message generation

Published Feb 20, 2025 · Updated Nov 4, 2025

Resource exhaustion in PHPJabbers Car Park Booking System 3.0 allows remote authenticated users to disrupt email service via repeated requests. The Email Settings feature accepts repeated send actions without rate limits, generating an excessive volume of messages for a legitimate user. Low-privilege access to the web interface is required, and exploitation consumes mail-processing resources rather than altering data.

CVSS severity4.3
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

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Summary

What happened

Resource exhaustion in PHPJabbers Car Park Booking System 3.0 allows remote authenticated users to disrupt email service via repeated requests. The Email Settings feature accepts repeated send actions without rate limits, generating an excessive volume of messages for a legitimate user. Low-privilege access to the web interface is required, and exploitation consumes mail-processing resources rather than altering data.

The record

CVE
CVE-2023-51309
Published
Feb 20, 2025
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-770, CAPEC-125, T1499.003
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

4.3CISA ADP VulnrichmentCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L

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 exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CAPEC-125Flooding
T1499.003Application Exhaustion Flood

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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