How severe is CVE-2019-12621?

CVE-2019-12621 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2019-12621 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-12621?

CVE-2019-12621 primarily affects Cisco Hyperflex Hx220c M5 Firmware. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-12621?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2019-12621 published?

CVE-2019-12621 was published on 2019-08-21 and last updated on 2026-06-17.

CVE-2019-12621

CVE-2019-12621 is a high-severity vulnerability in Cisco Hyperflex Hx220c M5 Firmware with a CVSS 3.x base score of 7.4. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-327.

Key facts

Severity: High (CVSS 3.x base score 7.4)
CVSS v2: 5.8
EPSS exploit prediction: 0% (30th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-327
Affected product: Cisco Hyperflex Hx220c M5 Firmware
Published: 2019-08-21
Last modified: 2026-06-17

Description

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.

Frequently asked questions

What is CVE-2019-12621?: 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.
How severe is CVE-2019-12621?: CVE-2019-12621 has a CVSS 3.x base score of 7.4, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2019-12621 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (30th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-12621?: CVE-2019-12621 primarily affects Cisco Hyperflex Hx220c M5 Firmware. In total, 10 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-12621?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2019-12621 published?: CVE-2019-12621 was published on 2019-08-21 and last updated on 2026-06-17.

References

https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190821-hyperflex-sslkey

Affected products (10)

cpe:2.3:o:cisco:hyperflex_hx220c_m5_firmware:3.0\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx220c_m5_firmware:3.5\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx240c_m5_firmware:3.0\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx240c_m5_firmware:3.5\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx220c_af_m5_firmware:3.0\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx220c_af_m5_firmware:3.5\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx240c_af_m5_firmware:3.0\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx240c_af_m5_firmware:3.5\(2a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx220c_edge_m5_firmware:3.0\(1a\):*:*:*:*:*:*:*
cpe:2.3:o:cisco:hyperflex_hx220c_edge_m5_firmware:3.5\(2a\):*:*:*:*:*:*:*

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