EUVD-2026-77317
GHSA-vg87-cmh7-p8wr
Severity by source
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/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
Network-reachable, low-complexity overflow but requires router admin authentication (PR:L); memory corruption on the router yields high C/I/A with scope unchanged.
Primary rating from Vendor (VulDB).
CVSS VectorVendor: VulDB
Lifecycle Timeline
2DescriptionCVE.org
A flaw has been found in D-Link DIR-878 120B05. This impacts the function SetWan3Settings of the component WAN Settings. This manipulation of the argument Primary/Secondary causes stack-based buffer overflow. Remote exploitation of the attack is possible.
Articles & Coverage 1
AnalysisAI
Stack-based buffer overflow in the D-Link DIR-878 wireless router (firmware 120B05) lets an attacker corrupt the stack through the SetWan3Settings handler of the WAN Settings component by supplying an oversized Primary/Secondary argument (typically DNS/gateway fields). Successful exploitation can crash the device or achieve arbitrary code execution on the router. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires network access to the DIR-878's web administration interface and valid administrative authentication (CVSS PR:L) to invoke the SetWan3Settings action of the WAN Settings component; the attacker then supplies an oversized Primary or Secondary WAN argument to overflow the stack buffer. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 4.0 base of 9.4 (AV:N/AC:L/AT:N/PR:L/UI:N with high vulnerable- and subsequent-system impact) reflects a low-complexity network-reachable overflow, but the PR:L requirement means the attacker must be authenticated to the router's admin interface - a meaningful limiter that the headline score understates. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | Full exploit scenario with step-by-step reproduction available after sign-in. |
| Remediation | No vendor-released patch identified at time of analysis; DIR-878 is a legacy model that may have reached end-of-support, so a fixed firmware version may never ship - verify current status on the D-Link support site (https://www.dlink.com/) and monitor D-Link security announcements for a firmware update, applying it immediately if released. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours: Identify D-Link DIR-878 devices running firmware 120B05 in your environment and immediately restrict access to administrative functions using network segmentation or access control lists. …
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Same weakness CWE-121 – Stack-based Buffer Overflow
View allSame technique Buffer Overflow
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External POC / Exploit Code
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