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CVE-2020-7796 (GCVE-0-2020-7796)

Vulnerability from cvelistv5 – Published: 2020-02-18 21:14 – Updated: 2026-02-18 04:56
VLAI CISA Shadowserver Previdian
Summary
Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: active Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-17 00:00 UTC
CWE
  • n/a
  • CWE-918 - Server-Side Request Forgery (SSRF)
Assigner
References
CISA
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 3149d83f-5286-4119-826e-a9c509a8c291

Vulnerability ID: CVE-2020-7796

Status: Confirmed

Status Updated: 2026-02-17 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-02-17
Asserted: 2026-02-17
Scope
Notes: KEV entry: Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability | Affected: Synacor / Zimbra Collaboration Suite | Description: Synacor Zimbra Collaboration Suite (ZCS) contains a server-side request forgery vulnerability if WebEx zimlet installed and zimlet JSP is enabled. | Required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. | Due date: 2026-03-10 | Known ransomware campaign use (KEV): Unknown | Notes (KEV): https://wiki.zimbra.com/wiki/Zimbra_Releases/8.8.15/P7 ; https://nvd.nist.gov/vuln/detail/CVE-2020-7796
Evidence

Type: Vendor Report

Signal: Successful Exploitation

Confidence: 80%

Source: cisa-kev

Details
Cwes CWE-918
Feed CISA Known Exploited Vulnerabilities Catalog
Product Zimbra Collaboration Suite
Due Date 2026-03-10
Date Added 2026-02-17
Vendorproject Synacor
Vulnerabilityname Synacor Zimbra Collaboration Suite (ZCS) Server-Side Request Forgery Vulnerability
Knownransomwarecampaignuse Unknown
References
Created: 2026-02-18 06:44 UTC | Updated: 2026-02-18 06:44 UTC
Shadowserver
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: 0b25781a-e632-4e30-bf8b-302346c5e2fc

Vulnerability ID: CVE-2020-7796

Status: Confirmed

Status Updated: 2026-07-19 00:00 UTC

Exploited: Yes

Characteristics
Severity: 98.0
Timestamps
First Seen: 2023-10-14
Asserted: 2023-10-14
Last Seen: 2026-07-19
Scope
Asset Exposure: ['internet-facing']
Notes: Affected: Zimbra / Zimbra Collaboration Suite | Class: email | Severity: Critical (CVSS 9.8) | IoT: no | In CISA KEV: yes | Honeypot connections on 2026-07-19: 1
Evidence

Type: Honeypot

Signal: In The Wild Attempts

Confidence: 70%

Source: shadowserver

Details
1D 1
Iot no
Feed Shadowserver Foundation honeypot/exploited-vulnerabilities
Type http-scan
Class email
7D Avg 0
Vendor Zimbra
30D Avg 1
90D Avg 2
Product Zimbra Collaboration Suite
Cisa Kev yes
Connections 1
Observation Date 2026-07-19
Vulnerability Class CVSS
Vulnerability Score 9.8
Vulnerability Severity Critical
References
Created: 2026-06-30 09:22 UTC | Updated: 2026-07-21 01:01 UTC
Previdian
Known Exploited Vulnerability - GCVE BCP-07 Compliant
KEV entry ID: f411261f-76fa-41bf-a5c4-a6fda2fdadb0

Vulnerability ID: CVE-2020-7796

Status: Confirmed

Status Updated: 2026-05-28 00:00 UTC

Exploited: Yes

Timestamps
First Seen: 2026-05-28
Asserted: 2026-05-28
Scope
Notes: KEVIntel entry: Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled. | Affected: Zimbra / Zimbra Collaboration Suite | CVSS: 9.8 (CRITICAL) | EPSS: 0.85416 | Used in malware: unknown | Not yet in CISA KEV: False
Evidence

Type: Public Report

Signal: Successful Exploitation

Confidence: 70%

Source: kevintel

Details
Feed KEVIntel (kevintel.com)
Title Zimbra Collaboration Suite (ZCS) before 8.8.15 Patch 7 allows SSRF when WebEx zimlet is installed and zimlet JSP is enabled.
Vendor Zimbra
Product Zimbra Collaboration Suite
Added Date 2026-05-28T00:00:00.000Z
Cvss Score 9.8
Epss Score 0.85416
Cvss Severity CRITICAL
Epss Percentile 0.99691
Used In Malware unknown
Ahead Of Cisa Kev 
{
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  "unit": "day"
}
Not Yet In Cisa Kev False
References
Created: 2026-06-23 14:03 UTC | Updated: 2026-07-10 06:14 UTC
Show details on NVD website
To clipboard 

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}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.