No exploitation reportedFix available

CVE-2021-37727

Q: Is CVE-2021-37727 actively exploited?

Active exploitation of CVE-2021-37727 has not been confirmed. Its EPSS score was 3.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2021-37727?

CVE-2021-37727 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-10-12
Fixed in8.7.1.3 · 8.6.0.11 · 8.5.0.12 · 6.5.4.20 · 6.4.4.8-4.2.4.19
WeaknessCWE-78

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A remote arbitrary command execution vulnerability was discovered in HPE Aruba Instant (IAP) version(s): 6.4.x.x: 6.4.4.8-4.2.4.18 and below; Aruba Instant 6.5.x.x: 6.5.4.20 and below; Aruba Instant 8.5.x.x: 8.5.0.12 and below; Aruba Instant 8.6.x.x: 8.6.0.11 and below; Aruba Instant 8.7.x.x: 8.7.1.3 and below. Aruba has released patches for Aruba Instant (IAP) that address this security vulnerability.

Timeline

dates in UTC

2021-10-1215:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-37727?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-37727?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Arubanetworks aruba instant

Branch	Affected	Fixed in	Source
8.7	≥ 8.7.0.0, < 8.7.1.3	8.7.1.3	NVD
8.6	≥ 8.6.0.0, < 8.6.0.11	8.6.0.11	NVD
8.5	≥ 8.5.0.0, < 8.5.0.12	8.5.0.12	NVD
6.5	≥ 6.5.4.0, < 6.5.4.20	6.5.4.20	NVD
6.4	≥ 6.4.0.2-4.1.0.0, < 6.4.4.8-4.2.4.19	6.4.4.8-4.2.4.19	NVD

Siemens scalance w1750d firmwareversion to verify

Branch	Affected	Fixed in	Source
8.7+	≥ 8.7.1.3	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-21-315-06 CISA1 known affected
Siemens SCALANCE W1750D
SCALANCE W1750D

Full record on NVD

Fix

Update Arubanetworks aruba instant to 8.7.1.3 · 8.6.0.11 · 8.5.0.12 · 6.5.4.20 · 6.4.4.8-4.2.4.19
Vendor fix CISA ICSA-21-315-06 · 1 productUpdate to V8.7.1.3 or later version
Vendor fix CISA ICSA-21-315-06 · 1 productUpdate to V8.7.1.9 or later version
Workaround from the vendor CISA ICSA-21-315-06 · 2 productsBlock access to the Aruba Instant Command Line Interface from all untrusted users
Workaround from the vendor CISA ICSA-21-315-06 · 2 productsBlock access to the Aruba Instant web-based management interface from all untrusted users
Workaround from the vendor CISA ICSA-21-315-06 · 2 productsEnabling the Enhanced PAPI Security feature where available will prevent exploitation of these vulnerabilities. Please contact TAC for assistance if needed
Workaround from the vendor CISA ICSA-21-315-06 · 2 productsBlock access for Aruba Instant device on port UDP/8211 from all untrusted users

Advisories and patches

cert-portal.siemens.comPatch
www.arubanetworks.comVendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.2read 2026-10-23
NVDCVSS 2.09read 2026-10-23
NVDweakness (CWE)CWE-78read 2026-10-23
FIRST EPSSEPSS score3.1 %2026-10-22

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Published: 2021-10-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-37727?

Is CVE-2021-37727 actively exploited?

Active exploitation of CVE-2021-37727 has not been confirmed. Its EPSS score was 3.1% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-37727?

CVE-2021-37727 has a CVSS v3 base score of 7.2 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H.

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