Cyber Resilience

CVE-2021-33266

CriticalPublic PoC

Published: 01 December 2021

Published
01 December 2021
Modified
21 November 2024
KEV Added
—
Patch
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CVSS Score v3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score 0.0263 86.0th percentile
Risk Priority 21 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2021-33266 is a critical-severity Out-of-bounds Write (CWE-787) vulnerability in Dlink Dir-809 Firmware. Its CVSS base score is 9.8 (Critical).

Operationally, ranked in the top 14.0% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.

EU & UK References

Vulnerability details

D-Link DIR-809 devices with firmware through DIR-809Ax_FW1.12WWB03_20190410 were discovered to contain a stack buffer overflow vulnerability in the function FUN_8004776c in /formVirtualApp. This vulnerability is triggered via a crafted POST request.

CWE(s)
CWE-787

Related Threats

No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.

Affected Assets

dlink
dir-809 firmware
≤ 1.12wwb03

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.

SI-16 Memory Protection
addresses: CWE-787

Out-of-bounds writes that corrupt control flow or inject shellcode are rendered non-executable by the same memory protections.

References