Vulnerability

CVE-2022-27925

High· 7.2KEVEXPLOITCVSS7.2EPSS94%

.rules3/5

Synacor Zimbra Collaboration Suite (ZCS) Arbitrary File Upload Vulnerability

Synacor Zimbra Collaboration Suite (ZCS) contains flaw in the mboximport functionality, allowing an authenticated attacker to upload arbitrary files to perform remote code execution. This vulnerability was chained with CVE-2022-37042 which allows for unauthenticated remote code execution.

Threat signal

100/100

Severe

Severity

high

CVSS

7.2

EPSS

94%

Active

KEV

CISA KEV — actively exploited

Ransomware: Known1381d overdue

AffectedSynacor — Zimbra Collaboration Suite (ZCS)

Added to KEV

2022-08-11

Federal patch due (BOD 22-01)

2022-09-01

Required action (CISA verbatim)

Apply updates per vendor instructions.

Vendor advisory + references

CISA description: “Synacor Zimbra Collaboration Suite (ZCS) contains flaw in the mboximport functionality, allowing an authenticated attacker to upload arbitrary files to perform remote code execution. This vulnerability was chained with CVE-2022-37042 which allows for unauthenticated remote code execution.”

CVSS

v3.1Open in FIRST calculator →

7.2/ 10HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack VectorNetworkExploitable remotely over the internet — no local access needed.
Attack ComplexityLowNo special conditions — exploit works reliably.
Privileges RequiredHighAdmin / root privileges required.
User InteractionNoneFully automated — no victim action needed.
ScopeUnchangedImpact contained to the vulnerable component.
Confidentiality ImpactHighTotal disclosure of sensitive data.
Integrity ImpactHighTotal compromise of integrity — full data modification possible.
Availability ImpactHighTotal loss of availability — full DoS possible.

EPSS

Exploit prediction · 30-day horizonFIRST.org →

94.3%

probability of exploitation in next 30 days

p100

higher than 100% of all CVEs

3-day trend↑ 0pp

Statistically about to be weaponized — top-tier triage urgency.

Vendor VEX

No VEX statements published for CVE-2022-27925. Vendors publish VEX (Vulnerability Exploitability eXchange) to assert per-product whether a CVE is actually exploitable in their distribution.

SSVCAct

Active exploitation with total impact on essential/support systems

exploitation: active
automatable: no
impact: total
mission: support

Lifecycle

2022-08-11Added to CISA KEVransomware: Known
2022-08-11Public exploit observedmetasploit
2022-08-11Published
2022-09-01Federal patch due (BOD 22-01)
2026-06-12Last modified1 source

No source-event history recorded yet. New revisions will appear here as ingestors re-fetch this CVE.