What’s Vulnerable › Vulnerabilities

CVE-2021-47854: DD-WRT 45723 - UPNP Buffer Overflow

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-01-21 · updated 2026-06-17
• Weakness: CWE-120

Description

DD-WRT version 45723 contains a buffer overflow vulnerability in the UPNP network discovery service that allows remote attackers to potentially execute arbitrary code. Attackers can send crafted M-SEARCH packets with oversized UUID payloads to trigger buffer overflow conditions on the target device.

Affected products

• embeDD GmbH DD-WRT: 45723

References

• https://dd-wrt.com/
• https://download1.dd-wrt.com/dd-wrtv2/downloads/betas/2021/
• https://ssd-disclosure.com/ssd-advisory-dd-wrt-upnp-buffer-overflow/
• https://www.exploit-db.com/exploits/49730
• https://www.vulncheck.com/advisories/dd-wrt-upnp-buffer-overflow

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