What is CVE-2021-34735?

CVE-2021-34735 is a high-severity vulnerability in Cisco Ata 190, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 8.8/10. Published 2021-10-06.

How severe is CVE-2021-34735?

High severity. CVSS v3 base score is 8.8 out of 10.

Resource exhaustion in Cisco Ata 190

CVE-2021-34735

Multiple vulnerabilities in the Cisco ATA 190 Series Analog Telephone Adapter Software could allow an attacker to perform a command injection attack resulting in remote code execution or cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.

Published 2021-10-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.019 (78.6th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 79th percentile — 78.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.019 · newest: 0.019 · change: 0.000

Affected products

Weakness classification (CWE)

CWE-770 — Allocation of Resources Without Limits or Throttling

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ata19x-m… (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2021-34735?: CVE-2021-34735 is a high-severity vulnerability in Cisco Ata 190, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 8.8/10. Published 2021-10-06.
How severe is CVE-2021-34735?: High severity. CVSS v3 base score is 8.8 out of 10.