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CVE-2020-12846

HIGH
8
CVSS Score
Published: June 3, 2020 at 04:21 PM UTC
Updated: June 17, 2026 at 02:52 AM UTC
2 products affected across 1 vendorZimbra Collaboration SuiteCollaboration

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Severity
HIGH8
Exploit prediction
EPSS 3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Zimbra Collaboration Suite· Synacor
95%
v < 8.8.158.8.158.8.15 p18.8.15 p28.8.15 p38.8.15 p48.8.15 p58.8.15 p68.8.15 p78.8.15 p88.8.15 p99.0.09.0.0 p19.0.0 p2
Affected range stops below 8.8.15, so it looks safe — our inference, not a vendor statement
Collaboration· Synacor
75%
v < 8.8.158.8.158.8.15 p18.8.15 p28.8.15 p38.8.15 p48.8.15 p58.8.15 p68.8.15 p78.8.15 p88.8.15 p99.0.09.0.0 p19.0.0 p2
Affected range stops below 8.8.15, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

x_refsource_MISCRelease NotesVendor Advisory
Source: [email protected]
https://wiki.zimbra.com/wiki/Security_Center
x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://wiki.zimbra.com/wiki/Zimbra_Releases/9.0.0/P3
x_refsource_MISCVendor Advisory
Source: [email protected]
https://wiki.zimbra.com/wiki/Zimbra_Security_Advisories

CVSS

8HIGH[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
REQUIRED
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
HIGH
Availability
HIGH
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-434

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