U.S. CISA adds DD-WRT, Langflow and WordPress flaws to its Known Exploited Vulnerabilities catalog

DD-WRT firmware before build 45724 contains a stack-based buffer overflow (CWE-121) caused by an unsafe strcpy in the UPnP handling code (ssdp_msearch in router/upnp/src/ssdp.c). An unauthenticated remote attacker can trigger it by sending a crafted SSDP M-SEARCH request to a UPnP-enabled interface, overflowing an internal fixed buffer. Successful exploitation can crash the router or allow code execution and full device compromise, consistent with the high confidentiality, integrity and availability impacts in the 8.1 CVSS score. Exposure is limited because UPnP is disabled by default and, by default, listens only on internal interfaces, so risk is concentrated on DD-WRT routers where UPnP has been enabled and on networks where an attacker has LAN access. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-21, has public proofs of concept, and is reportedly being exploited in the wild by the C0XMO IoT botnet (a Gafgyt variant) to propagate and remove rival malware.

Do: Upgrade affected DD-WRT routers to build 45724 or later. If upgrading is not immediately possible, disable UPnP, or verify that UPnP/SSDP is bound only to internal interfaces and that UDP port 1900 (SSDP) and M-SEARCH traffic are not reachable from the WAN. Per the CISA KEV required action, apply mitigations in line with BOD 26-04 guidance, and check any internet-exposed DD-WRT device for signs of compromise (e.g., unexpected botnet traffic) if UPnP was enabled.

CVE-2026-0770 is an unauthenticated remote code execution vulnerability in Langflow, an open-source visual builder for LLM and AI agent workflows. The flaw, categorized as CWE-829 (inclusion of functionality from an untrusted control sphere), resides in how the exec_globals parameter supplied to the validate endpoint is handled, allowing code or resources from an untrusted control sphere to be included and executed. A remote attacker with no credentials can send a crafted request to that endpoint and execute arbitrary code in the context of root on the affected installation. Any deployment of an affected Langflow version is exposed, with internet-facing self-hosted or containerized instances at greatest risk. The issue was disclosed through Trend Micro's Zero Day Initiative (ZDI-CAN-27325) and was added to CISA's Known Exploited Vulnerabilities catalog on 2026-07-21, confirming active in-the-wild exploitation; no public proof-of-concept is known.

Do: Apply the vendor's patched Langflow release and any prescribed mitigations per CISA guidance; because exploitation requires no authentication and executes as root, prioritize internet-exposed instances immediately (EPSS is high at 63.4%). Per BOD 26-04, if mitigations or updates are unavailable for a given deployment, discontinue use of the product. Review access logs for unexpected unauthenticated requests to the validate endpoint containing crafted exec_globals parameters, and restrict network exposure of Langflow instances until patched.

WordPress Core contains an interpretation-conflict flaw (CWE-436) in the REST API batch endpoint that causes route confusion, allowing requests to be dispatched to an unintended route. When chained with the author__not_in WP_Query SQL injection (CVE-2026-60137), this allows a remote, unauthenticated attacker to inject SQL and escalate to remote code execution. Any WordPress site running 6.9.x before 6.9.5 or 7.0.x before 7.0.2 is affected, with no privileges or user interaction required (CVSS 3.1: 9.8). Exploitation is confirmed in the wild: the issue was added to CISA's KEV on 2026-07-21, EPSS is 97.3% (100th percentile), and a public PoC is reportedly fueling mass scanning under the 'wp2shell' label.

Do: Upgrade immediately to WordPress 6.9.5 (for 6.9.x) or 7.0.2 (for 7.0.x), or later, which fixes both this flaw and the chained SQL injection CVE-2026-60137; prioritize internet-facing sites because exploitation is unauthenticated and being mass-scanned. Review web and REST API logs for suspicious batch requests, SQL errors, unexpected admin users, or modified files. Organizations in scope for CISA BOD 26-04 must apply the required mitigations per vendor instructions or discontinue use.