Cyber Resilience

CVE-2023-44386

Vapor 4.83.2 – 4.84.2

Published
05 October 2023
Modified
21 November 2024
Patch / advisory
View advisory
CVSS Score v3.1 5.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS Score 0.0060 46th percentile
Risk Priority 45 floored blend · peak EPSS

Summary

CVE-2023-44386 is a medium-severity Improper Handling of Extra Values (CWE-231) vulnerability in Vapor Vapor. Its CVSS base score is 5.3 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked at the 46th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability Data

Vapor is an HTTP web framework for Swift. There is a denial of service vulnerability impacting all users of affected versions of Vapor. The HTTP1 error handler closed connections when HTTP parse errors occur instead of passing them on. The…

more

issue is fixed as of Vapor release 4.84.2.

CWE(s)
CWE-231CWE-617CWE-696

Related Threats

MITRE ATT&CK Enterprise Techniques

T1499.004 Application or System Exploitation Impact
Adversaries may exploit software vulnerabilities that can cause an application or system to crash and deny availability to users.
attack.mitre.org →
T1499 Endpoint Denial of Service Impact
Adversaries may perform Endpoint Denial of Service (DoS) attacks to degrade or block the availability of services to users.
attack.mitre.org →
T1068 Exploitation for Privilege Escalation Privilege Escalation
Adversaries may exploit software vulnerabilities in an attempt to elevate privileges.
attack.mitre.org →
T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
Derived from this CVE’s CWE(s) via the direct CWE→ATT&CK cross-walk.

CVEs Like This One

CVE-2024-21631Same product: Vapor Vapor
CVE-2026-28499Same vendor: Vapor
CVE-2026-27120Same vendor: Vapor
CVE-2023-31136Same vendor: Vapor
CVE-2026-34219Shared CWE-617
CVE-2024-53856Shared CWE-617
CVE-2026-52952Shared CWE-617
CVE-2024-39949Shared CWE-617
CVE-2026-27623Shared CWE-617
CVE-2026-10822Shared CWE-617

Affected Assets

vapor
vapor
4.83.2 — 4.84.2

Mitigating Controls

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly require robust input validation that prevents improper handling of extra values.

DE.CM-09 partial match
prevents

Runtime monitoring of software can detect assertion-triggered crashes as adverse events.

ID.RA-01 partial match
prevents

Vulnerability identification processes can discover and record reachable-assertion flaws before deployment.

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.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can detect extra-value handling issues but does not prevent them by itself.

A.8.25 Secure development life cycle partial match
prevents

Secure development lifecycle includes input validation and parameter handling that can prevent extra-value processing flaws.

A.8.26 Application security requirements partial match
prevents

Application security requirements typically mandate strict input validation and parameter count checks.

A.8.27 Secure system architecture and engineering principles partial match
prevents

Secure architecture principles encourage robust input handling but do not specifically address extra-value scenarios.

A.8.28 Secure coding partial match
prevents

Secure coding standards directly require validation of the exact number and type of input parameters.

A.8.32 Change management none match
none

Change management may catch order-related issues during reviews but does not address root cause.

References