Have exploitation attempts been observed for CVE-2020-5849?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists CVE-2020-5849 as a known exploited vulnerability. Confidence is confirmed.

What exploitation activity has Previdian observed?

Previdian has not yet recorded sensor-observed exploitation attempts for CVE-2020-5849. Our sensors continue to monitor for activity targeting this CVE.

Which versions are affected?

Version-level data is not available; Previdian tracks Limetech Unraid.

Yes. CVE-2020-5849 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

Vulnerability report

Exploitation attempts observed in the wild Confirmed confidence In CISA KEV

CVE-2020-5849

Unraid 6.8.0 allows authentication bypass.

Limetech / Unraid

Watch CVE-2020-5849 Browse KEV feed

Severity: CVSS 7.5 · High
Confidence: Confirmed
Exploit status: Exploitation attempts observed in the wild
EPSS: 93.2%
First observed: —
Last observed: —

Decision summary

What security teams need to know first

Direct answers before the deeper technical record.

What it is

CVE-2020-5849 is an unauthenticated vulnerability affecting Limetech Unraid. Unraid 6.8.0 allows authentication bypass.

Have exploitation attempts been observed?

Yes. Exploitation attempts have been reported for this vulnerability. Previdian lists it as a known exploited vulnerability. Listed in CISA KEV. Confidence is confirmed.

Who is affected?

Limetech / Unraid.

What should we do?

Prioritize remediation. Validate affected assets and apply vendor fixes on an accelerated timeline.

Overview

Unraid 6.8.0 allows authentication bypass

Unraid 6.8.0 allows authentication bypass.

Published: 16 Mar 2020
Exploitation Attempts Reported: 03 Nov 2021
Attack vector: Remote
Complexity: Low
Privileges: None
User interaction: None

CVE References

CVE Record CVE.org · CVE Record https://www.cve.org/CVERecord?id=CVE-2020-5849
sysdream.com/news/lab sysdream.com · CVE Record https://sysdream.com/news/lab/
forums.unraid.net/forum/7-announcements forums.unraid.net · CVE Record https://forums.unraid.net/forum/7-announcements/
sysdream.com/news/lab/2020-02-06-cve-2020-5847-cve-2020-5... sysdream.com · CVE Record https://sysdream.com/news/lab/2020-02-06-cve-2020-5847-cve-2020-5849-...
packetstormsecurity.com/files/157275/Unraid-6.8.0-Authentication-Byp... packetstormsecurity.com · CVE Record http://packetstormsecurity.com/files/157275/Unraid-6.8.0-Authenticati...

Exploitation evidence

Evidence of exploitation attempts

Third-party attestation and first-party sensor observation are shown separately so teams can judge the evidence chain.

Exploitation attempts observed in the wild

CISA

Recorded 03 Nov 2021

A trusted third party reported exploitation attempts.

Proof of concept available

Recorded 28 Apr 2025

Public scanner or PoC coverage increases practical exploitability.

Known exploited vulnerability sources

Per-source evidence links for KEV attestations are available through the Previdian Pro API.

Learn about Pro API access

Source	Added
CISA First	2021-11-03 00:00 UTC

Detection

Operational artifacts and observed signals

Make the evidence actionable in scanner, SOC, and edge-control workflows.

Observed signals

Request targets
User-Agents
Callback hosts: 0; 0; 0

Request targets and User-Agents available in Pro. Callback host details available in Enterprise.

Scanner coverage

Metasploit template detected 28 Apr 2025.

View Metasploit template

Virtual patch status

No Previdian virtual patch is currently available. Future rules ship for ModSecurity, Cloudflare, and AWS WAF.

Learn about virtual patches →

Scanner Artifacts

Scanner and exploit-framework references linked to this CVE.

Scanner	Reference	Detected
Metasploit	https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/unraid_auth_bypass_exec.rb	28 Apr 2025

Risk and context

Severity, weaknesses, and research context

CVSS v3.1

7.5 High

Potential damage if exploited. Separate from whether attackers are using it.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS

93.2%

Estimated chance of exploitation in the next 30 days. Previdian's warning comes from evidence, not this score.

Weaknesses

Incorrect Comparison CWE-697

All CVSS Scores

CVSS v3.1 7.5 High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v2.0 5.0 Medium

AV:N/AC:L/Au:N/C:P/I:N/A:N

Potential Proof of Concepts

These PoCs are unverified and could contain malware. Use at your own risk.

unraid_auth_bypass_exec

metasploit · Created Unknown

Metasploit module for CVE-2020-5849

Timeline

From disclosure to observed exploitation attempts

28 Apr 2025
15:02 UTC

Metasploit module available

Exploit module available
28 Apr 2025
15:02 UTC

Public PoC available

Public proof-of-concept code published
03 Nov 2021
00:00 UTC

Added to CISA KEV

Listed in the CISA Known Exploited Vulnerabilities catalog
16 Mar 2020
17:24 UTC

CVE published

Vulnerability disclosed publicly
06 Jan 2020
00:00 UTC

CVE ID reserved

Identifier reserved by the CNA

Pro API

Automate this intelligence

Confidence, exploit status, sensor telemetry, PoCs, scanner integrations, mentions, and tags are available programmatically for VM, SOC, and CTI workflows.

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Evidence confidence and provenance
First-party sensor telemetry
PoC and scanner references
Affected versions and enrichment
Automation-ready JSON delivery

GET /api/v2/pro/kevs/CVE-2020-5849

Sample API response

{
  "cve_id": "CVE-2020-5849",
  "confidence": "Confirmed",
  "cvss_score": 7.5,
  "cvss_estimated": false,
  "epss_score": 0.93243,
  "exploit_status": {
    "exploited_in_the_wild": true,
    "active_exploitation_observed": false
  },
  "sensor_telemetry": { "attempts": 0, "sensors": 0 }
}