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CVE-2020-27861

29
FAUCET Score

CVE-2020-27861 is a critical vulnerability affecting NETGEAR Orbi 2.5.1.16 routers, specifically within the UA_Parser utility. It allows unauthenticated, network-adjacent attackers to execute arbitrary code with root privileges by crafting a malicious Host Name option in a DHCP request. This vulnerability carries a CVSS score of 8.8 (HIGH), indicating a severe risk due to its low attack complexity and complete compromise potential for confidentiality, integrity, and availability. While there is no evidence of active exploitation or publicly available exploit code in Metasploit or ExploitDB, community discussion on Reddit suggests awareness of this unauthenticated command injection.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.6.1.38CPE matchmatch criteria
cpe:2.3:o:netgear:cbk40_firmware:*:*:*:*:*:*:*:*
< 2.6.1.38CPE matchmatch criteria
cpe:2.3:o:netgear:cbk43_firmware:*:*:*:*:*:*:*:*
< 2.6.1.38CPE matchmatch criteria
cpe:2.3:o:netgear:cbr40_firmware:*:*:*:*:*:*:*:*
< 1.0.1.82CPE matchmatch criteria
cpe:2.3:o:netgear:ex6200_firmware:*:*:*:*:*:*:*:*
< 1.0.0.210CPE matchmatch criteria
cpe:2.3:o:netgear:ex7700_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
ADJACENT_NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.03%
Probability of exploitation in next 30 days
EPSS Percentile
79.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0203 is in the 88th percentile among its peer group of 1,875 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.2 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

kb.netgear.com / 000062507/Security-Advisory-for-Unauthenticated-Command-Injection-Vulnerability-on-Some-Extenders-and-Orbi-WiFi-Systems
Vendor Advisory
zerodayinitiative.com / advisories/ZDI-20-1430
Third Party AdvisoryVDB Entry