Threats / Synacor / CVE-2022-27925
CVE-2022-27925
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-06-22
Synacor Zimbra Collaboration Suite (ZCS) vulnerability
Zimbra Collaboration Suite contains a path traversal flaw in mboximport functionality allowing authenticated attackers to upload arbitrary files and execute code. When chained with CVE-2022-37042, unauthenticated remote code execution is po
Verdict
Today item, not a backlog item.
This vulnerability enables remote code execution through file upload abuse in a widely-deployed email collaboration platform. Active exploitation in ransomware campaigns and high EPSS score indicate immediate threat to organizations running affected ZCS versions.
CISA KEV Yes · 2022-08-113Ransomware use Flagged3EPSS 0.98163 (verify live)4Exploit Weaponized · public PoC5
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
34 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-08-11), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.98163 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
Affected: Synacor, Zimbra Collaboration Suite (ZCS). Confirm exact fixed builds in the vendor advisory.
Weakness (CWE)
Mapped to CWE-22 Path Traversal — weakness family: Path traversal / file.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I exploit CVE-2022-37042 to gain initial unauthenticated access to the Zimbra server.
Business
Attackers bypass authentication controls, eliminating the first security perimeter.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I leverage the mboximport path traversal flaw to upload malicious files outside intended directories.
Business
Arbitrary file placement compromises filesystem integrity and application isolation.
3
Lateral reach — past segmentation narrative 3
Attacker
I execute uploaded files to achieve remote code execution with Zimbra service privileges.
Business
Attackers gain full control of email infrastructure and access to organizational communications.
4
Data at risk — exfiltration narrative 4
Attacker
I establish persistence and move laterally through the network using compromised credentials and data.
Business
Ransomware operators encrypt critical systems and exfiltrate sensitive business data for extortion.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05