D-Link DWR-M921 formDiskFormat system os command injection

published 2026-09-14 56 d ago modified 2026-09-15 54 d ago also EUVD-2026-77343

cvss: 9.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 3.6%; EPSS 3.6% chance of exploitation in 30 days, percentile 89%
public exploits: 0; none known

A flaw has been found in D-Link DWR-M921 1.1.52. Impacted is the function system of the file /boafrm/formDiskFormat. This manipulation of the argument partition causes os command injection. The attack may be initiated remotely. The exploit has been published and may be used.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 54 d ago (2026-09-15)

Exploit prediction

3.60% chance of exploitation in the next 30 days, higher than 89% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

gist.github.com https://gist.github.com/H3rmesk1t/1f7efbf4584ce13222e8b0c669e7784a referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.4	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
CNA	3.0	9.1	CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R
CNA	2.0	8.3	AV:N/AC:L/Au:M/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
CNA	4.0	8.5	CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	9.1	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
CNA	2.0	8.3	AV:N/AC:L/Au:M/C:C/I:C/A:C

Affected products

D-Link DWR-M921

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command
CWE-77 Improper Neutralization of Special Elements used in a Command

References

gist.github.com /H3rmesk1t/1f7efbf4584ce13222e8b0c669e7784a
exploit
vuldb.com /vuln/403244
vdb-entry, technical-description
vuldb.com /vuln/403244/cti
signature, permissions-required
vuldb.com /cve/CVE-2026-90702
third-party-advisory
vuldb.com /submit/917692
third-party-advisory
dlink.com /
product

Sources

CVE List CVE-2026-90702
NVD CVE-2026-90702

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary