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CVE-2021-27140

31
FAUCET Score

CVE-2021-27140 is a critical vulnerability affecting FiberHome HG6245D devices, specifically firmware versions through RP2613. It allows for the exposure of sensitive authentication data, including passwords and session cookies, which are stored in cleartext within the device's web.log HTTP logs. With a CVSS score of 7.5 (HIGH), this vulnerability can be exploited remotely over the network with low attack complexity, leading to a high impact on confidentiality without requiring user interaction. Currently, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= rp2613CPE matchmatch criteria
cpe:2.3:o:fiberhome:hg6245d_firmware:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
18.86%
Probability of exploitation in next 30 days
EPSS Percentile
97.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.1886 is in the 95th percentile among its peer group of 51,551 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

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

Remediation

Remediation records are not available for this CVE.

References

pierrekim.github.io / blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html
ExploitThird Party Advisory