Raw vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HCVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.
Summary
CVE-2023-51316 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Phpjabbers Bus Reservation System. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 46% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
The strongest mitigations our analysis identified map to SC-5 (Denial-of-service Protection) and SC-6 (Resource Availability) — see the control section below for these in your framework.
Deeper analysis AI-assisted summary
Synthesised by an AI model from the NVD description and linked references — a reading aid, not an authoritative source.
CVE-2023-51316 is a vulnerability stemming from a lack of rate limiting in the 'Forgot Password' feature of PHPJabbers Bus Reservation System version 1.1. This flaw enables attackers to trigger an excessive volume of email generation targeted at a legitimate user account, resulting in a denial-of-service (DoS) condition. The issue is classified under CWE-400 (Uncontrolled Resource Consumption) and carries a CVSS v3.1 base score of 7.5 (AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H), indicating high severity primarily due to its impact on availability.
Unauthenticated attackers (PR:N) can exploit this vulnerability remotely over the network (AV:N) with low complexity and no user interaction required. By repeatedly submitting forgot password requests for a valid user, an attacker can overwhelm the system's email generation process, flooding the mail server or service with a large number of messages and causing resource exhaustion that disrupts service availability for the targeted user or the application as a whole.
Advisories detailing the vulnerability are available from Packet Storm Security, including exploit details at http://packetstormsecurity.com/files/176497/PHPJabbers-Bus-Reservation-System-1.1-Missing-Rate-Limiting.html and https://packetstorm.news/files/id/176497. The official product page at https://www.phpjabbers.com/bus-reservation-system/#sectionDemo provides demo access but no specific patch or mitigation guidance is referenced in the available disclosures. Security practitioners should implement rate limiting on forgot password endpoints and monitor email generation logs in affected deployments.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2023-56037
Vulnerability Data
A lack of rate limiting in the 'Forgot Password' feature of PHPJabbers Bus Reservation System v1.1 allows attackers to send an excessive amount of email for a legitimate user, leading to a possible Denial of Service (DoS) via a large…
more
amount of generated e-mail messages.
- CWE(s)
Related Threats
CVEs Like This One
Affected Assets
Mitigating Controls
Mitigating Controls (NIST 800-53 r5) AI
SC-5 directly limits the effects of resource-exhaustion events that constitute uncontrolled consumption.
SC-6 enforces explicit allocation limits on resources, structurally preventing the weakness from occurring.
Process isolation confines resource consumption to separate domains, reducing blast radius without stopping the root flaw.
Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI
Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.
Pre-agreed severity-based prioritization and resource allocation during incident triage reduce the likelihood that an attacker-induced resource exhaustion will overwhelm the organization before corrective action is taken.
Early notification of anomalous resource consumption or system malfunctions enables throttling or isolation before availability is lost.
Specifying log storage limits and rotation procedures reduces the risk that unbounded log growth will exhaust disk or memory resources and cause denial of service.
Resource-utilization monitoring and alerting on bottlenecks or overloads limits the impact of denial-of-service or resource-exhaustion attacks.
A.8.20 implements network-level protections (firewalls, segmentation, protocol hardening, monitoring, authentication of systems/devices) that can limit abuse of a resource-consuming weakness but do not stop the weakness from being exploitable; the flaw remains present in the product and can still be triggered from an authorized or internal context.
Monitoring network service usage and applying controls to restrict access when necessary limits an attacker’s ability to consume excessive resources through unrestricted or unauthenticated service calls.
Hardening callouts derived
DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.
- No fine-grained STIG row for CWE-400, a class-level weakness. Rules are authored against its narrower children: CWE-770.