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CVE-2019-3976

27
FAUCET Score

CVE-2019-3976 is an arbitrary directory creation vulnerability affecting MikroTik RouterOS versions 6.45.6 Stable, 6.44.5 Long-term, and below. An authenticated user can exploit this by installing a malicious upgrade package, leading to directory creation and enabling the developer shell. This vulnerability carries a high CVSS score of 8.8, indicating a network-based attack with low complexity and potential for high impact on confidentiality, integrity, and availability. While there is no evidence of active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB), it has received some community and media attention.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.44.5CPE matchmatch criteria
cpe:2.3:o:mikrotik:routeros:*:*:*:*:ltr:*:*:*
<= 6.45.6CPE matchmatch criteria
cpe:2.3:o:mikrotik:routeros:*:*:*:*:-:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.68%
Probability of exploitation in next 30 days
EPSS Percentile
74.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0168 is in the 72nd percentile among its peer group of 17,844 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (6)

aristavendor investigatingvia llm_extracted
naturalintelligencevendor investigatingvia llm_extracted
netgearvendor investigatingvia llm_extracted
opencartvendor investigatingvia llm_extracted
payloadcmsvendor investigatingvia llm_extracted
safarivendor investigatingvia llm_extracted

Vendor Advisories (6)

netgearllm-netgear-0449dfbc051ec94fHIGH

MikroTik RouterOS Multiple Vulnerabilities

Oct 28, 2019
aristallm-arista-3e170c1c6fc80c94HIGH

MikroTik RouterOS Multiple Vulnerabilities

Oct 28, 2019
opencartllm-opencart-94d254e733d0a401HIGH

MikroTik RouterOS Multiple Vulnerabilities

Oct 28, 2019
safarillm-safari-76e7b8485ac638f3HIGH

MikroTik RouterOS Multiple Vulnerabilities

Oct 28, 2019
naturalintelligencellm-naturalintelligence-ff21ec02277749a8HIGH

MikroTik RouterOS Multiple Vulnerabilities

Oct 28, 2019
payloadcmsllm-payloadcms-8e5133e57395bba9HIGH

MikroTik RouterOS Multiple Vulnerabilities

Oct 28, 2019

References

tenable.com / security/research/tra-2019-46
Third Party Advisory