CVE-2022-40946
Published: 16 April 2023
Summary
CVE-2022-40946 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Dlink Dir-819 Firmware. Its CVSS base score is 7.5 (High).
Operationally, ranked in the top 9.7% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2022-40946 affects D-Link DIR-819 devices running firmware version 1.06 on hardware version A1. The flaw permits a denial-of-service condition through the sys_token parameter supplied to the cgi-bin/webproc endpoint with a getpage=html/index.html request, corresponding to CWE-400 uncontrolled resource consumption and carrying a CVSS 3.1 score of 7.5.
An unauthenticated attacker with network access can send a crafted HTTP request that triggers the condition, resulting in loss of availability while leaving confidentiality and integrity unaffected. No user interaction or privileges are required.
Public references include a D-Link security bulletin page, a PacketStorm advisory, and a GitHub repository containing proof-of-concept code. The EPSS score has remained flat at 0.0540 with no material increase since disclosure.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-44194
Vulnerability details
On D-Link DIR-819 Firmware Version 1.06 Hardware Version A1 devices, it is possible to trigger a Denial of Service via the sys_token parameter in a cgi-bin/webproc?getpage=html/index.html request.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Limiting concurrent sessions directly prevents uncontrolled resource consumption by capping the number of active sessions per user or account.
Analysis identifies uncontrolled resource consumption indicative of denial-of-service or abuse attempts.
Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.
Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.
Alternate site allows resumption of operations if resource exhaustion at the primary site is exploited to cause unavailability.
Alternate telecommunications services enable resumption of essential functions when primary services become unavailable due to uncontrolled resource consumption.
The team can analyze and respond to resource exhaustion incidents, reducing the impact of attacks that exploit uncontrolled consumption weaknesses.
Timely maintenance support and spare parts enable rapid recovery from failures induced by uncontrolled resource consumption, shortening the impact window of denial-of-service attacks.