November 14, 2026

CVE Watchtower

CVE-2026-90693D-Link DIR-878 Stack-based Buffer Overflow

NVD

Vulnerability Summary

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.
Severity Level
CRITICAL(9.9)
Published Date
Sep 14, 2026
Last Modified
Sep 15, 2026
Exploitation Status
No confirmed exploitation yet
EPSS Score (30-Day)
0.91%Probability
Root Weakness (CWE)
CWE-121: Stack-based Buffer Overflow β†—
The buffer being overwritten is allocated on the stack.
CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer β†—
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the intended boundary of the buffer.
CVSS v4.0 Base Metrics — Score 9.4 (CRITICAL)
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
Attack VectorNetwork
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredLow
User InteractionNone
Confidentiality (Vulnerable System)High
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)High
Integrity (Subsequent System)High
Availability (Subsequent System)High
Show CVSS v3.x metrics (score 9.9)
CVSS v3.1 Base Metrics — Score 9.9 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:X/RL:X/RC:R
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredLow
User InteractionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh

Affected & Patched Versions

Affected Versions
  • D-Link DIR-878 120B05
Patched Versions
No patched version published yet
Until a fix ships, reduce exposure:
  • Restrict access to the affected service or interface to trusted networks.
  • Disable the affected feature if you do not need it.
  • Watch the vendor advisory for a firmware or software update.

What to do

Plan remediation soon. No exploitation is confirmed yet, but the severity is critical.

  1. Check whether you run D-Link DIR-878 and which version.
  2. No patched version is listed yet. Limit access to the affected service to trusted networks, and disable the feature if you can.
  3. Subscribe to the vendor advisory so you learn when a fix ships.

Timeline

  • Sep 14, 2026Published
  • Sep 15, 2026Record last modified

Score, severity and exploitation changes are tracked from the day Watchtower started logging them.

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External References

Data last checked: Nov 14, 2026 01:09 UTC