What is CVE-2019-1209?

CVE-2019-1209 is a medium-severity vulnerability in Microsoft Lync, classified under Information Disclosure. CVSS score: 6.5/10. Published 2019-09-11.

How severe is CVE-2019-1209?

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

Information disclosure in Microsoft Lync

CVE-2019-1209

An information disclosure vulnerability exists in Lync 2013, aka 'Lync 2013 Information Disclosure Vulnerability'.

Vulnerability class: Information Disclosure

Published 2019-09-11 · last modified 2026-06-17.

CVSS v3 metric

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

EPSS exploit prediction

EPSS: 0.062 (93.4th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 93rd percentile — 93.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.062 · newest: 0.062 · change: 0.000

Affected products

Microsoft Lync — versions 2013
Microsoft Lync Server — versions 2013

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1209 (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2019-1209?: CVE-2019-1209 is a medium-severity vulnerability in Microsoft Lync, classified under Information Disclosure. CVSS score: 6.5/10. Published 2019-09-11.
How severe is CVE-2019-1209?: Medium severity. CVSS v3 base score is 6.5 out of 10.