How severe is CVE-2021-37726?

CVE-2021-37726 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-37726 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-37726?

CVE-2021-37726 primarily affects Arubanetworks Aruba Instant. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-37726?

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

When was CVE-2021-37726 published?

CVE-2021-37726 was published on 2021-10-12 and last updated on 2026-06-17.

CVE-2021-37726

CVE-2021-37726 is a critical-severity vulnerability in Arubanetworks Aruba Instant with a CVSS 3.x base score of 9.8. 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-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 10.0
EPSS exploit prediction: 2% (82nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Arubanetworks Aruba Instant
Published: 2021-10-12
Last modified: 2026-06-17

Description

A remote buffer overflow vulnerability was discovered in HPE Aruba Instant (IAP) version(s): Aruba Instant 8.7.x.x: 8.7.0.0 through 8.7.1.2. Aruba has released patches for Aruba Instant (IAP) that address this security vulnerability.

Frequently asked questions

What is CVE-2021-37726?: A remote buffer overflow vulnerability was discovered in HPE Aruba Instant (IAP) version(s): Aruba Instant 8.7.x.x: 8.7.0.0 through 8.7.1.2. Aruba has released patches for Aruba Instant (IAP) that address this security vulnerability.
How severe is CVE-2021-37726?: CVE-2021-37726 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-37726 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (82nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-37726?: CVE-2021-37726 primarily affects Arubanetworks Aruba Instant. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-37726?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2021-37726 published?: CVE-2021-37726 was published on 2021-10-12 and last updated on 2026-06-17.

References

Affected products (2)

cpe:2.3:a:arubanetworks:aruba_instant:*:*:*:*:*:*:*:*
cpe:2.3:o:siemens:scalance_w1750d_firmware:*:*:*:*:*:*:*:*

More vulnerabilities in Arubanetworks Aruba Instant

CVE-2016-2031 — Critical (CVSS 9.8): Multiple vulnerabilities exists in Aruba Instate before 4.1.3.0 and 4.2.3.1 due to insufficient validation of…
CVE-2018-7084 — Critical (CVSS 9.8): A command injection vulnerability is present that permits an unauthenticated user with access to the Aruba Instant web…
CVE-2016-2032 — High (CVSS 7.5): A vulnerability exists in the Aruba AirWave Management Platform 8.x prior to 8.2 in the management interface of an…
CVE-2018-7083 — High (CVSS 7.5): If a process running within Aruba Instant crashes, it may leave behind a "core dump", which contains the memory…
CVE-2021-37732 — High (CVSS 7.2): A remote arbitrary command execution vulnerability was discovered in HPE Aruba Instant (IAP) version(s): Aruba Instant…
CVE-2021-37730 — High (CVSS 7.2): A remote arbitrary command execution vulnerability was discovered in HPE Aruba Instant (IAP) version(s): Aruba Instant…

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