CVE-2019-12621

mediumpriority · track · 30OT risk · elevatedEPSS 0.004 · 31 %ileEURUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

0.38% (31st) EPSS

CVSS 5.8 · medium

Is it mine?

13 products

Check your exposure

Who says so?

5 sources

cnnvd · enisa_euvd · fstec_bdu · cisco_csaf

EPSS · scored 2026-10-27

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.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedCisco HyperFlex HX-Seriescisco_csaf
Cisco has released software updates that address this vulnerability.
https://software.cisco.com

cvss

Technical severity, 0–10. One row per scoring source.

7.4

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.8–7.4

v2.05.8mediumAV:N/AC:M/Au:N/C:P/I:P/A:Nprimary · NVD / NIST USexploitability 8.6 · impact 4.9

v3.17.4highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Nprimary · NVD / NIST USexploitability 2.2 · impact 5.2

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · ENISA EU

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · psirt@cisco.com USexploitability 1.6 · impact 5.2

v3.06.8mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · Cisco PSIRT US

v3.16.8mediumAV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Nsecondary · FSTEC (BDU) RU

v3.16.8mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:Usecondary · CVSS-BT (t0sche)

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: no · Technical Impact: totalcoordinatorcisa_ssvcUS

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-327USprimaryCWE-320USCWE-320US

affected products (13)

Products and version ranges known to be affected.

Cisco Cisco HyperFlex HX-Seriesall versionscisco_csafUS
Cisco Cisco HyperFlex HX-Seriesunspecified → 4.0(1a)enisa_euvdEU
Cisco Systems Inc. Cisco HyperFlex HX-Series≤ 4.0(1a)fstec_bduRU
cisco hyperflex hx220c af m5 firmware= 3.0(1a)nvdUScpe:2.3:o:cisco:hyperflex_hx220c_af_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx220c af m5 firmware= 3.5(2a)nvdUScpe:2.3:o:cisco:hyperflex_hx220c_af_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx220c edge m5 firmware= 3.0(1a)nvdUScpe:2.3:o:cisco:hyperflex_hx220c_edge_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx220c edge m5 firmware= 3.5(2a)nvdUScpe:2.3:o:cisco:hyperflex_hx220c_edge_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx220c m5 firmware= 3.0(1a)nvdUScpe:2.3:o:cisco:hyperflex_hx220c_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx220c m5 firmware= 3.5(2a)nvdUScpe:2.3:o:cisco:hyperflex_hx220c_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx240c af m5 firmware= 3.0(1a)nvdUScpe:2.3:o:cisco:hyperflex_hx240c_af_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx240c af m5 firmware= 3.5(2a)nvdUScpe:2.3:o:cisco:hyperflex_hx240c_af_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx240c m5 firmware= 3.0(1a)nvdUScpe:2.3:o:cisco:hyperflex_hx240c_m5_firmware:*:*:*:*:*:*:*:*
cisco hyperflex hx240c m5 firmware= 3.5(2a)nvdUScpe:2.3:o:cisco:hyperflex_hx240c_m5_firmware:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

cisco-sa-20190821-hyperflex-sslkeyCisco HyperFlex Static SSL Key Vulnerability2019-08-21csaf · cisco_csafUS
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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-hyperflex-sslkey ["https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-hyperflex-sslkey"]

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu cisco_csaf nvd NVD CVE.org MITRE

published 2019-08-21modified 2026-06-17

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+913 more

references (5)

External citations — patches, advisories, analysis.

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