Memory corruption via malformed DHCP Option 125
Published Sep 8, 2026 · Updated Sep 8, 2026
Stack-based buffer overflow in D-Link DIR-895L A1_102b07 allows remote attackers to corrupt memory through crafted DHCP traffic. The udhcpcd sendOffer and sendACK paths in serverpacket.c parse attacker-controlled TR-111 Option 125 suboption data without enforcing fixed stack-buffer bounds. No authentication or user interaction is required, but the attacker must share the local network; exploitation can interrupt or compromise router operation.
Summary
What happened
Stack-based buffer overflow in D-Link DIR-895L A1_102b07 allows remote attackers to corrupt memory through crafted DHCP traffic. The udhcpcd sendOffer and sendACK paths in serverpacket.c parse attacker-controlled TR-111 Option 125 suboption data without enforcing fixed stack-buffer bounds. No authentication or user interaction is required, but the attacker must share the local network; exploitation can interrupt or compromise router operation.
The record
- CVE
- CVE-2026-86509
- Published
- Sep 8, 2026
- Updated
- Sep 8, 2026
- Vendor
- D-Link
- Product
- DIR-895L
- Classifications
- CWE-121, CWE-119, T1210
- Attack vector
- adjacent
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 8, 2026CVE publishedPublication date reported by the CVE source.
- Sep 8, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=A1_102b07
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- DIR-895L TR-111 Option 125 parsing proof of conceptproof of concept · unverified
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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