CVE-2026-53920

Published: Ott 23, 2026 Last Modified: Ott 23, 2026
ExploitDB:
Other exploit source:
Google Dorks:
HIGH 8,7
Source: [email protected]
Attack Vector: network
Attack Complexity: low
Privileges Required: none
User Interaction: none
Confidentiality: N/A
Integrity: N/A
Availability: N/A

Description

odhcpd is the DHCPv6, DHCPv4, and router-advertisement server used by OpenWrt. From version 17.01.0 to before version 25.12.3, odhcpd's DHCPv6 IA parser accepts an IA_NA or IA_PD option whose body is shorter than struct dhcpv6_ia_hdr, casts the option header to that full structure, and reads ia->iaid before proving that the IA body contains the IAID field. If an unauthenticated network-adjacent client places a zero-length or otherwise short IA option at the end of odhcpd's 8192-byte receive stack buffer, the IAID read crosses from data_buf into adjacent stack memory. The disclosed bytes are then reflected in the DHCPv6 reply IAID; prior ARM validation showed data_buf[8192:8196] disclosing the saved stack canary, and wider stack scans can leak ASLR-useful stack/process contents. This issue has been patched in version 25.12.3.

125

Out-of-bounds Read

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Availability Other
Potential Impacts:
Read Memory Bypass Protection Mechanism Dos: Crash, Exit, Or Restart Varies By Context
Applicable Platforms
Languages: Memory-Unsafe, C, C++
Technologies: ICS/OT
View CWE Details
126

Buffer Over-read

Draft
Abstraction: Variant Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality Availability Integrity
Potential Impacts:
Read Memory Bypass Protection Mechanism Dos: Crash, Exit, Or Restart
Applicable Platforms
Languages: Memory-Unsafe, C, C++
View CWE Details
200

Exposure of Sensitive Information to an Unauthorized Actor

Draft
Abstraction: Class Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality
Potential Impacts:
Read Application Data
Applicable Platforms
Technologies: Not Technology-Specific, Web Based, Mobile
Likelihood of Exploit: High
View CWE Details
201

Insertion of Sensitive Information Into Sent Data

Draft
Abstraction: Base Structure: Simple
Common Consequences
Security Scopes Affected:
Confidentiality
Potential Impacts:
Read Files Or Directories Read Memory Read Application Data
Applicable Platforms
All platforms may be affected
View CWE Details
https://github.com/openwrt/odhcpd/commit/719fc3abc0d7e70598…
https://github.com/openwrt/odhcpd/commit/719fc3abc0d7e7059871f9f572fb05ada86b8f…
https://github.com/openwrt/odhcpd/commit/f2275efc72a87a95f9…
https://github.com/openwrt/odhcpd/commit/f2275efc72a87a95f971f159babcbadc5d241d…
https://github.com/openwrt/odhcpd/security/advisories/GHSA-…
https://github.com/openwrt/odhcpd/security/advisories/GHSA-p769-5v73-pc4f