F1: Derived UDP recovery credential (V3.5.2.1)

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Document type: local CVE candidate assessment, not a published CVE Record. CVE ID: unassigned. Product scope: Anpviz IPC-D240W-S V3.5.2.1 captured from the owner’s MCA40E camera; the V3.6.3.1 comparison image is an MCA50E image sent in error and was not flashed to this model.

Finding

The serial-derived recovery value is accepted independently of configured accounts. The new image changes the derivation but retains the privileged branch.

Status in this image: original finding or lead.

Evidence limit: Old and new firmware expose identifier inputs in search responses; a live acceptance test was not performed on V3.6.3.1.

Classification and severity

• Proposed CWE: CWE-798, CWE-288
• CVSS v4.0 score: 7.2 High, provisional scenario
• CVSS v4.0 vector: CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N
• Scoring basis: Conditional upper-bound scenario: a reachable UDP control path accepts the calculated value and permits configuration changes; no live login was performed.
• CVE candidacy: Needs coordinator/CNA review for grouping, affected models and version status; do not equate this finding ID with a CVE ID.

Source screenshots

The PNGs are rendered, line-numbered excerpts of existing Ghidra C-like decompilation, not photographs of the Ghidra GUI or recovered vendor source. The original export is authoritative; image selection can omit relevant lines elsewhere in the function.

• F1: recovery value and UDP login — F1-search_reply-old — V3.5.2.1/F1/F1-search_reply-old.c lines 295–311; source SHA-256 b21084d695cdbef29d5da1fef83dd867384d44c18fbcdb1242f305f463a2260e.
• F1: recovery value and UDP login — F1-search_thread_init-old — V3.5.2.1/F1/F1-search_thread_init-old.c lines 58–74; source SHA-256 6de61d8b4a45c0c2866b3061cf424547fb0acb77a3e02bb7f82e803a255cb100.
• F1: recovery value and UDP login — F1-udp_login-old — V3.5.2.1/F1/F1-udp_login-old.c lines 97–113; source SHA-256 910c4d643f9296a8e6d73a7f7bce5cffbaaec3bd82aafd85bb2881332fade59a.
• F1: recovery value and UDP login — F1-udp_login-old — V3.5.2.1/F1/F1-udp_login-old.c lines 118–134; source SHA-256 910c4d643f9296a8e6d73a7f7bce5cffbaaec3bd82aafd85bb2881332fade59a.

Related published CVEs

• No verified related CVE linked to this specific finding; this is not an exhaustive database search.

Case references

• Evidence index
• Initial public report
• Remediation review
• CERT/CC VRF #26-10-FZTVG; CISA Case #116607.

Source exports

• F1-search_reply-old.c
• F1-search_thread_init-old.c
• F1-udp_login-old.c