PoC Published for CVE-2026-53921: CVE-2026-53921-PoC-Exploit
July 28, 2026 · GitHub · Severity: CRITICAL
A proof-of-concept (PoC) exploit for CVE-2026-53921, a critical stack overflow vulnerability (CVSS 9.8) in odhcpd, has been published on GitHub. The vulnerability affects OpenWrt's DHCPv6 implementation, allowing remote code execution (RCE) via dual-vector (IA_NA/IA_PD) overflow. The PoC includes MIPS/ARM shellcode, ROP chains, SOCKS5 proxy functionality, persistence mechanisms, log wiping, and mass scanning capabilities. The exploit was developed by GitHub user tc4dy and is available in a public repository. This vulnerability poses a significant risk to OpenWrt users, particularly those running DHCPv6 services, as it enables attackers to execute arbitrary code remotely. The exploit's advanced features, including persistence and log wiping, make it particularly dangerous for unpatched systems. While the PoC is labeled for ethical use, its public availability increases the likelihood of malicious exploitation, underscoring the urgency for affected users to apply patches or mitigations. The repository has garnered attention, with 4 stars since its creation on July 28, 2026.
Key Takeaways
- Organizations should review the published PoC and apply vendor patches immediately.
- Public PoC availability lowers the barrier for exploitation by both attackers and security tools.
- Proof of Concept exploit published on GitHub: CVE-2026-53921-PoC-Exploit. CVE-2026-53921 – odhcpd Stack Overflow (CVSS 9.8) 🛡️ Vuln detailed and comprehensive Write-Up and Verifier & Multi-exploit fo. A public proof-of-concept exploit has been published for CVE-2026-53921, demonstrating exploitation methodology.