What is CVE-2021-1471?

CVE-2021-1471 is a critical-severity vulnerability in Cisco Jabber, classified under Improper Null Termination. CVSS score: 9.9/10. Published 2021-03-24.

How severe is CVE-2021-1471?

Critical severity. CVSS v3 base score is 9.9 out of 10.

Vulnerability in Cisco Jabber

CVE-2021-1471

Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for MacOS, and Cisco Jabber for mobile platforms could allow an attacker to execute arbitrary programs on the underlying operating system with elevated privileges, access sensitive information, intercept protected network traffic, or cause a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.

Published 2021-03-24 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.014 (71.5th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.014 · change: +0.000

Affected products

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2021-1471?: CVE-2021-1471 is a critical-severity vulnerability in Cisco Jabber, classified under Improper Null Termination. CVSS score: 9.9/10. Published 2021-03-24.
How severe is CVE-2021-1471?: Critical severity. CVSS v3 base score is 9.9 out of 10.