Is CVE-2021-37748 in the CISA KEV catalog?

No. CVE-2021-37748 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-37748?

CVE-2021-37748 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2021-37748?

CVE-2021-37748 has an EPSS score of 7.29% (94th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-37748?

Upgrade ht801 firmware to 1.0.29 or later.

CVE & CISA-KEV Catalog

CVE-2021-37748

HIGHEPSS 94th pctl

8.8

CVSS v3

NVD

Description

Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before 1.0.29 allow remote authenticated users to execute arbitrary code as root via a crafted manage_if setting, thus bypassing the intended restrictions of this shell and taking full control of the device. There are default weak credentials that can be used to authenticate.

CWE-787Out-of-bounds Write

How to fix

Remediation Available

ht801 firmwareNVD

Affected:< 1.0.29Fixed in:1.0.29CVE-2021-37748derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploit Intelligence

7.29%probability of exploitation in 30 days

94thpercentile

High risk: more likely to be exploited than 94% of all known CVEs.

References

Exploit1

secforce.com

Vendor Advisory1

grandstream.com

Third-Party Advisory1

github.com

Related Vulnerabilities

Other CWE-787 (Out-of-bounds Write) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-22457	Critical	9.0	100%	KEV + Ransom	Fix
CVE-2025-0282	Critical	9.0	100%	KEV + Ransom	-
CVE-2015-3113	Critical	9.8	100%	KEV	Fix
CVE-2021-20038	Critical	9.8	100%	KEV + Ransom	-
CVE-2023-4863	High	8.8	100%	KEV	Fix
CVE-2020-16040	Medium	6.5	100%	-	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.