CVE-2020-12846

Name: CVE-2020-12846
Creator: NVD / NIST
Published: 2020-06-03T17:15:24.793+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 8/10EPSS 2.60%

Last modified Jun 17, 2026

CVE-2020-12846 is a high-severity vulnerability rated 8/10 on the CVSS scale. Zimbra before 8.8.15 Patch 10 and 9.x before 9.0.0 Patch 3 allows remote code execution via an avatar file. There is potential abuse of /service/upload servlet in the webmail subsystem. EPSS estimates a 2.60% chance of exploitation in the next 30 days.

Description

Zimbra before 8.8.15 Patch 10 and 9.x before 9.0.0 Patch 3 allows remote code execution via an avatar file. There is potential abuse of /service/upload servlet in the webmail subsystem. A user can upload executable files (exe,sh,bat,jar) in the Contact section of the mailbox as an avatar image for a contact. A user will receive a "Corrupt File" error, but the file is still uploaded and stored locally in /opt/zimbra/data/tmp/upload/, leaving it open to possible remote execution.

Metrics

CVSS 3.1

8/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H

EPSS Probability

2.60%

83.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Synacor	Zimbra Collaboration Suite	< 8.8.15
Synacor	Zimbra Collaboration Suite	8.8.15
Synacor	Zimbra Collaboration Suite	9.0.0

References

https://wiki.zimbra.com/wiki/Security_CenterRelease Notes, Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P3Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory
https://wiki.zimbra.com/wiki/Security_CenterRelease Notes, Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P3Vendor Advisory
https://wiki.zimbra.com/wiki/Zimbra_Security_AdvisoriesVendor Advisory

Timeline

Published: Jun 3, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-12846?

How severe is CVE-2020-12846?

CVE-2020-12846 has a CVSS score of 8/10 (HIGH severity). The EPSS model estimates a 2.60% probability of exploitation in the next 30 days.

How do I fix CVE-2020-12846?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-12846?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST