How severe is CVE-2021-26581?

CVE-2021-26581 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-26581 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-26581?

CVE-2021-26581 affects Hpe Superdome Flex Server Firmware. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-26581?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-26581 published?

CVE-2021-26581 was published on 2021-04-01 and last updated on 2026-06-17.

CVE-2021-26581

CVE-2021-26581 is a medium-severity vulnerability in Hpe Superdome Flex Server Firmware with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 4.0
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Hpe Superdome Flex Server Firmware
Published: 2021-04-01
Last modified: 2026-06-17

Description

A potential security vulnerability has been identified in HPE Superdome Flex server. A denial of service attack can be remotely exploited leaving hung connections to the BMC web interface. The monarch BMC must be rebooted to recover from this situation. Other BMC management is not impacted. HPE has made the following software update to resolve the vulnerability in HPE Superdome Flex Server: Superdome Flex Server Firmware 3.30.142 or later.

Frequently asked questions

What is CVE-2021-26581?: A potential security vulnerability has been identified in HPE Superdome Flex server. A denial of service attack can be remotely exploited leaving hung connections to the BMC web interface. The monarch BMC must be rebooted to recover from this situation. Other BMC management is not impacted. HPE has made the following software update to resolve the vulnerability in HPE Superdome Flex Server: Superdome Flex Server Firmware 3.30.142 or later.
How severe is CVE-2021-26581?: CVE-2021-26581 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-26581 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-26581?: CVE-2021-26581 affects Hpe Superdome Flex Server Firmware. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-26581?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-26581 published?: CVE-2021-26581 was published on 2021-04-01 and last updated on 2026-06-17.

References

https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf04102en_us

Affected products (1)

cpe:2.3:o:hpe:superdome_flex_server_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Hpe Superdome Flex Server Firmware

CVE-2022-23702 — Medium (CVSS 6.7): A potential security vulnerability has been identified in HPE Superdome Flex and Superdome Flex 280 Servers. The…
CVE-2020-7137 — Medium (CVSS 6.7): A validation issue in HPE Superdome Flex's RMC component may allow local elevation of privilege. Apply HPE Superdome…
CVE-2019-11998 — Medium (CVSS 5.5): HPE Superdome Flex Server is vulnerable to multiple remote vulnerabilities via improper input validation of…
CVE-2022-37939 — Low (CVSS 2.3): A potential security vulnerability has been identified in HPE Superdome Flex and Superdome Flex 280 servers. The…

All CVEs affecting Hpe Superdome Flex Server Firmware →