CVE-2021-26422: microsoft lync_server
CVSS: 7.2v3.1HighModified
Published 11-05-2021Last modified 03-08-2024
Vulnerability summary
CVE-2021-26422 is a high (CVSS 7.2) vulnerability in microsoft lync_server. EPSS estimates a 2.22% chance of exploitation in the next 30 days, higher than 82.4% of scored vulnerabilities.
CVSS score
7.2/10
010
High · v3.1 (CVE.org)EPSS score
2.22%
0%100%
Low · 0.00 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Timeline
- 11-05-2021PublishedVulnerability first disclosed.
- 03-08-2024Last modifiedVulnerability information updated.
Description
Skype for Business and Lync Remote Code Execution Vulnerability
CVSS metrics
3 scores · 2 sources · 2 versionsHigh 7.2Preferred score · CVE.org (CNA)
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:CSourcesAll 2 agree
- NVDNIST7.2HighCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Medium 6.5Preferred score · NVD (NIST)
AV:N/AC:L/Au:S/C:P/I:P/A:PSourcesSingle source
EPSS trend
Probability
2.22%
Chance of exploitation in the next 30 days
Percentile
82%
Versus all other CVEs
30-day change
0.00 pp
From 2.22% on 19-09-2026
19-09-202619-10-2026
EPSS score2.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Microsoft5 products
- lync_server2013:cumulative_update_10
- microsoft lync server 2013 cu10≥ 8308.0, < 8308.1144
- skype_for_business_server2015:cumulative_update_11 | 2019:cumulative_update_5
- skype for business server 2015 cu11≥ 2015 CU11, < 9319.606
- skype for business server 2019 cu5≥ 1.0, < 2046.369
1 vendor · 5 products
References
1 links
portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2021-26422X Refsource MISCPatchVendor Advisory