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CVE-2021-37840

28
FAUCET Score

CVE-2021-37840 is a Cross-Site WebSocket Hijacking (CSWH) vulnerability affecting aaPanel through version 6.8.12, specifically within its /webssh functionality. This high-severity vulnerability (CVSS 8.8) allows an attacker to execute OS commands via WebSocket messages, contingent on the victim having configured the Terminal with at least one host and using a susceptible browser like Firefox. While the potential impact is high across confidentiality, integrity, and availability, there is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 6.8.12CPE matchmatch criteria
cpe:2.3:a:aapanel:aapanel:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

8.8HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
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
1.66%
Probability of exploitation in next 30 days
EPSS Percentile
74.2%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0166 is in the 73rd percentile among its peer group of 14,855 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 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 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

github.com / aaPanel/aaPanel/issues/74
ExploitThird Party Advisory
ssd-disclosure.com / ssd-advisory-aapanel-cswh-to-rce
ExploitThird Party Advisory