Airangel HSMX Gateway devices through 5.2.04 have Weak SSH Credentials.

published 2021-11-10 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-27696

cvss: 9.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 1.2%; EPSS 1.2% chance of exploitation in 30 days, percentile 67%
public exploits: 0; none known

Exploit prediction

1.18% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

etizazmohsin.com http://etizazmohsin.com/hsmx.html#ssh referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	9.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD	2.0	5.0	AV:N/AC:L/Au:N/C:P/I:N/A:N

Classification

Weakness

CWE-521 Weak Password Requirements

References

etizazmohsin.com /hsmx.html#ssh
exploit, third-party-advisory
airangel.com /hsmx-gateway/
product

Sources

CVE List CVE-2021-40520
NVD CVE-2021-40520

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