Synway SMG Gateway Management Software OS Command Injection via radius_address

published 2026-04-30 6 mo ago modified 2026-10-07 33 d ago also EUVD-2025-209597

cvss: 9.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 5.7%; EPSS 5.7% chance of exploitation in 30 days, percentile 93%
public exploits: 0; none known

Synway SMG Gateway Management Software contains an OS command injection vulnerability in the RADIUS configuration endpoint at /en/9-2radius.php where the radius_address POST parameter is split and interpolated directly into a sed command without sanitization. An unauthenticated remote attacker can inject arbitrary shell commands by submitting a POST request with crafted radius_address, radius_address2, shared_secret2, source_ip, timeout, or retry parameters along with save=1 and enable_radius=1 to achieve remote code execution. Exploitation evidence was first observed by the Shadowserver Foundation on 2025-07-11 (UTC).

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: total
Assessed: 6 mo ago (2026-04-30)

Exploit prediction

5.73% chance of exploitation in the next 30 days, higher than 93% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

mrxn.net https://mrxn.net/jswz/synway-9-2radius-rce.html referenced PoC, tagged "exploit" by a source, unverified
mp.weixin.qq.com https://mp.weixin.qq.com/s/PyepoFSuQ63E3RnpQa9nsA referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CNA	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA	4.0	9.3	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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

Affected products

Synway Information Engineering Co., Ltd. Synway SMG Gateway Management Software

Classification

Weakness

CWE-78 Improper Neutralization of Special Elements used in an OS Command

References

mrxn.net /jswz/synway-9-2radius-rce.html
technical-description, exploit, third-party-advisory
mp.weixin.qq.com /s/PyepoFSuQ63E3RnpQa9nsA
technical-description, exploit, third-party-advisory
github.com /projectdiscovery/nuclei-templates/blob/main/http/vulnerabilities/synway/synwaysmg-radius-rce.yaml
third-party-advisory
synway.net /
product
vulncheck.com /advisories/synway-smg-gateway-management-software-os-command-injection-via-radius-address
third-party-advisory

Sources

CVE List CVE-2025-71284
NVD CVE-2025-71284

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