Cisco HyperFlex Static SSL Key Vulnerability

published 2019-08-21 7 y ago modified 2026-06-17 4 mo ago also EUVD-2019-4212

cvss: 6.8; version 3.0, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.4%; EPSS 0.4% chance of exploitation in 30 days, percentile 31%
public exploits: 0; none known

A vulnerability in Cisco HyperFlex Software could allow an unauthenticated, remote attacker to perform a man-in-the-middle attack. The vulnerability is due to insufficient key management. An attacker could exploit this vulnerability by obtaining a specific encryption key for the cluster. A successful exploit could allow the attacker to perform a man-in-the-middle attack against other nodes in the cluster.

Patch / fix

fixed in 1

Cisco Cisco HyperFlex HX-Series 4.0(1a)

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: total
Assessed: 23 mo ago (2024-11-20)

Exploit prediction

0.38% chance of exploitation in the next 30 days, higher than 31% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.0	6.8	CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:N
NVD	3.1	7.4	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
NVD	2.0	5.8	AV:N/AC:M/Au:N/C:P/I:P/A:N

Affected products

Cisco Cisco HyperFlex HX-Series

Classification

Weakness

CWE-320 Key Management Errors
CWE-327 Use of a Broken or Risky Cryptographic Algorithm

References

tools.cisco.com /security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-hyperflex-sslkey
vendor-advisory

Sources

CVE List CVE-2019-12621
NVD CVE-2019-12621

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Summary