Page generated: 09 Nov 2026, 04:48 UTC
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CVE-2026-73570

A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated…

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A remote code execution vulnerability exists in Zimbra Collaboration (ZCS) before 10.1.20 when the optional zimbra-snmp package is installed and SNMP notifications are enabled. Due to improper sanitization of untrusted input during SNMP notification processing, an unauthenticated attacker can send specially crafted SMTP requests that may result in execution of arbitrary operating system commands as the Zimbra user.
CVSS 8.9 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
1.4/10
REALITY · THREAT PRIORITY
8.7/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 8.9: +1.34
  • Fresh EPSS: 71.66%: +0.36

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 27 documents and public datasets.

Hype components

Headline sample (25%)
30/100
Press, 30 days (60%)
10/100
Grounded branding (15%)
0/100
HYPE TOTAL14/100

Sources and documents

SOC Prime
Press · 23 Oct 2026, 13:56 · CVE-2026-73570: Zimbra Command Injection Attacks - SOC Prime
Rescana
Press · 07 Oct 2026, 07:00 · Zimbra Collaboration CVE-2026-73570 — Unauthenticated OS Command Injection via Crafted SMTP (KEV) - Rescana
Forkast News
Press · 05 Oct 2026, 07:00 · Four Providers, 15 CVEs, Three Days — The Agent Identity Stack Is Under Coordinated Attack - Forkast News
Forkast News
Press · 03 Oct 2026, 07:00 · Zimbra CVE-2026-73570 Harvested the Signing Keys That Authenticate Every Session on the Platform - Forkast News
SecurityWeek
Press · 01 Oct 2026, 07:00 · Zimbra Vulnerability Exploited in the Wild Prior to Public Disclosure - SecurityWeek
See all 27 source documents
Cyber Press
Press · 01 Oct 2026, 07:00 · Hackers Exploit Zimbra CVE-2026-73570 With Crafted Emails to Execute Commands Without Authentication - Cyber Press
The Register
Press · 01 Oct 2026, 07:00 · Microsoft catches hackers exploiting Zimbra bug before disclosure - The Register
The Hacker News
Press · 30 Sep 2026, 07:00 · Attackers Exploit Zimbra Flaw to Deploy Web Shells and Harvest Authentication Secrets - The Hacker News
Microsoft
Press · 30 Sep 2026, 07:00 · Unauthenticated command injection on internet-facing mail servers: tracking CVE-2026-73570 - Microsoft
Ars Technica
Press · 30 Sep 2026, 07:00 · Attackers have been exploiting critical Zimbra flaw to steal emails - Ars Technica
Rapid7
Press · 24 Sep 2026, 07:00 · When Business Email Compromise Starts Rewriting Reality - Rapid7
Help Net Security
Press · 30 Aug 2026, 07:00 · Week in review: Compromised Zimbra servers, previously patched Citrix NetScaler flaw exploited - Help Net Security
IT Pro
Press · 26 Aug 2026, 07:00 · Hackers have breached hundreds of Zimbra servers, despite a patch having been available for weeks - IT Pro
BleepingComputer
Press · 25 Aug 2026, 07:00 · Hackers breached over 270 Zimbra servers in ongoing attacks - BleepingComputer
BetaNews
Press · 25 Aug 2026, 07:00 · Zimbra SNMP flaw actively exploited, 274 servers hit - BetaNews
Help Net Security
Press · 25 Aug 2026, 07:00 · Unpatched Zimbra servers are falling to CVE-2026-73570 attacks - Help Net Security
GBHackers News
Press · 24 Aug 2026, 07:00 · Zimbra Collaboration Suite Flaw Actively Exploited to Execute Arbitrary Commands - GBHackers News
BleepingComputer
Press · 24 Aug 2026, 07:00 · CISA orders urgent patching of actively exploited Zimbra flaw - BleepingComputer
Dark Reading
Press · 24 Aug 2026, 07:00 · Exploited Zimbra Flaw Highlights Shrinking Window to Patch - Dark Reading
SOCRadar
Press · 24 Aug 2026, 07:00 · CVE-2026-73570: Zimbra RCE Exploited - SOCRadar
Security Affairs
Press · 22 Aug 2026, 07:00 · U.S. CISA adds Zimbra Collaboration Suite (ZCS) flaw to its Known Exploited Vulnerabilities catalog - Security Affairs
Security Affairs
Press · 21 Aug 2026, 07:00 · Poland’s CERT Warns of Active Exploitation of Critical Zimbra Collaboration Suite Flaw - Security Affairs
CyberSecurityNews
Press · 20 Aug 2026, 07:00 · Critical Zimbra RCE Vulnerability Actively Exploited in the Wild - CyberSecurityNews
Cyber Press
Press · 20 Aug 2026, 07:00 · Critical Zimbra OS Command Injection Vulnerability Exploited in the Wild - Cyber Press
BleepingComputer
Press · 20 Aug 2026, 07:00 · Critical Zimbra RCE flaw now actively exploited in attacks - BleepingComputer
The Hacker News
Press · 20 Aug 2026, 07:00 · Attackers Exploit Zimbra SNMP Flaw for Unauthenticated Remote Code Execution - The Hacker News
SecurityWeek
Press · 20 Aug 2026, 07:00 · Hackers Target Zimbra Servers in Active Exploitation Campaign - SecurityWeek

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

024681002 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 1.9Reality 8.703 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 1.6Reality 8.705 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 1.4Reality 8.7Nov 2Nov 3Nov 5

━ Hype Score (Perceived)  ━ Reality threat priority. Definition changes are not new attacks.

Public exploit evidence

3

Public exploit entries / repo candidates

See 3 repos with metrics
RepositoryStarsForksLanguageUpdated
gabrielunknown/CVE-2026-7357041Perl14 Sep 2026, 05:13
jishino567/CVE-2026-7357043Python25 Aug 2026, 10:36
BiuTrap/CVE-2026-7357000—02 Sep 2026, 06:21
Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 8.9; EPSS 71.7%
Attention, last 30 days
1 distinct story titles; 1 press documents; 1 publisher domains.
Technical potential
network access, no prior privileges, no user interaction, additional attack conditions.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 14:00:24.102380+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
13 Aug 2026, 15:19
First press mention
20 Aug 2026, 07:00
Added to the CISA KEV catalog
21 Aug 2026, 00:00
Latest press mention
23 Oct 2026, 13:56
Score calculated
05 Nov 2026, 14:00
PoCs on GitHub
3 repositories