What is CVE-2021-1569?

CVE-2021-1569 is a medium-severity vulnerability in Cisco Jabber, classified under CWE-399. CVSS score: 6.5/10. Published 2021-06-16.

How severe is CVE-2021-1569?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Improper input validation in Cisco Jabber

CVE-2021-1569

Multiple vulnerabilities in Cisco Jabber for Windows, Cisco Jabber for Mac, and Cisco Jabber for mobile platforms could allow an attacker to access sensitive information or cause a denial of service (DoS) condition. For more information about these vulnerabilities, see the Details section of this advisory.

Published 2021-06-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.008 (55.7th percentile), scored 2026-10-20.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 55.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Weakness classification (CWE)

References

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

Frequently asked questions

What is CVE-2021-1569?: CVE-2021-1569 is a medium-severity vulnerability in Cisco Jabber, classified under CWE-399. CVSS score: 6.5/10. Published 2021-06-16.
How severe is CVE-2021-1569?: Medium severity. CVSS v3 base score is 6.5 out of 10.