Edimax EW-7478APC POST Request formPPPoESetup stack-based overflow

published 2026-06-29 4 mo ago modified 2026-10-25 14 d ago also EUVD-2026-40075

cvss: 8.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.8%; EPSS 0.8% chance of exploitation in 30 days, percentile 57%
public exploits: 0; none known

A vulnerability was found in Edimax EW-7478APC 1.04. Affected is the function formPPPoESetup of the file /goform/formPPPoESetup of the component POST Request Handler. Performing a manipulation of the argument pppUserName results in stack-based buffer overflow. The attack can be initiated remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: total
Assessed: 4 mo ago (2026-06-29)

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 57% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

lavender-bicycle-a5a.notion.site https://lavender-bicycle-a5a.notion.site/EDIMAX-EW-7478APC-formPPPoESetup-34b53a41781f80208e6be16a764f001c referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	8.7	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
CNA	3.0	8.8	CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:X/RC:R
CNA	2.0	9.0	AV:N/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR
CNA	4.0	7.4	CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CNA	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CNA	2.0	9.0	AV:N/AC:L/Au:S/C:C/I:C/A:C

Affected products

Edimax EW-7478APC

Classification

Weakness

CWE-121 Stack-based Buffer Overflow
CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer

References

lavender-bicycle-a5a.notion.site /EDIMAX-EW-7478APC-formPPPoESetup-34b53a41781f80208e6be16a764f001c
exploit
vuldb.com /vuln/374572
vdb-entry, technical-description
vuldb.com /vuln/374572/cti
signature, permissions-required
vuldb.com /cve/CVE-2026-13564
third-party-advisory
vuldb.com /submit/844114
third-party-advisory

Sources

CVE List CVE-2026-13564
NVD CVE-2026-13564

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary