CVE-2021-37915
CVE-2021-37915 is a high-severity vulnerability in Grandstream Ht801 Firmware with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.
Key facts
- Severity: High (CVSS 3.x base score 8.8)
- CVSS v2: 9.0
- EPSS exploit prediction: 2% (78th percentile)
- Actively exploited: Not listed in CISA KEV
- Affected product: Grandstream Ht801 Firmware
- Published:
- Last modified:
Description
An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8. From the limited configuration shell, it is possible to set the malicious gdb_debug_server variable. As a result, after a reboot, the device downloads and executes malicious scripts from an attacker-defined host.
Frequently asked questions
- What is CVE-2021-37915?
- An issue was discovered on the Grandstream HT801 Analog Telephone Adaptor before 1.0.29.8. From the limited configuration shell, it is possible to set the malicious gdb_debug_server variable. As a result, after a reboot, the device downloads and executes malicious scripts from an attacker-defined host.
- How severe is CVE-2021-37915?
- CVE-2021-37915 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
- Is CVE-2021-37915 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2021-37915?
- CVE-2021-37915 affects Grandstream Ht801 Firmware. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2021-37915?
- 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-2021-37915 published?
- CVE-2021-37915 was published on 2021-10-28 and last updated on 2026-06-17.
References
- http://firmware.grandstream.com/BETA/Release_Note_HT80x_1.0.29.8.pdf
- http://www.grandstream.com/products/gateways-and-atas/analog-telephone-adaptors/product/ht801
- https://www.secforce.com/blog/exploiting-grandstream-ht801-ata-cve-2021-37748-cve-2021-37915/
Affected products (1)
- cpe:2.3:o:grandstream:ht801_firmware:*:*:*:*:*:*:*:*
More vulnerabilities in Grandstream Ht801 Firmware
- CVE-2021-37748 — High (CVSS 8.8): Multiple buffer overflows in the limited configuration shell (/sbin/gs_config) on Grandstream HT801 devices before…
- CVE-2020-5763 — High (CVSS 8.8): Grandstream HT800 series firmware version 1.0.17.5 and below contain a backdoor in the SSH service. An authenticated…
- CVE-2020-5760 — High (CVSS 7.8): Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to an OS command injection vulnerability.…
- CVE-2020-5762 — High (CVSS 7.5): Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to a denial of service attack against the…
- CVE-2020-5761 — High (CVSS 7.5): Grandstream HT800 series firmware version 1.0.17.5 and below is vulnerable to CPU exhaustion due to an infinite loop in…