Disclosed
CVE-2022-41721
A request smuggling attack is possible when using MaxBytesHandler. When using MaxBytesHandler, the body of an HTTP request is not fully consumed. When the server attempts to read HTTP2 frames from the connection, it will instead be reading the body of the HTTP request, which could be attacker-manipulated to represent arbitrary HTTP2 requests.
Exploitation Probability (EPSS)
Low Priority0.07%
The Exploit Prediction Scoring System (EPSS) uses machine learning to estimate the probability that a vulnerability will be exploited in the wild within the next 30 days.
0% (Theoretical)100% (Certainty)
7-Day Exploitation Trend
Vulnerability Timeline
2 eventsJan 13, 2023
Vulnerability Disclosed
Published to component-level vulnerability database.
Apr 4, 2025
Last Updated
Record updated with new analysis or tags.
Threat Actor Attribution
PREMIUM INTELAssociated Groups:Lazarus Group, APT28
Ransomware Campaigns:LockBit 3.0, BlackCat
IoCs (Indicators):14 IPs, 3 Hashes
Remediation & Mitigation
SOLUTIONOfficial patches and mitigation steps are available for this vulnerability.
# Update Command
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
apt-get update && apt-get upgrade -y specific-package
# Verify installation
dpkg -l | grep package-name
Affected Products
1 Total
golang/h2cAll Versions
References
https://go.dev/cl/447396Go
PatchVendor Advisory
https://go.dev/issue/56352Go
ExploitIssue TrackingPatchVendor Advisory
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X3H3EWQXM2XL5AGBX6UL443JEJ3GQXJN/Fedoraproject
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X5DXTLLWN6HKI5I35EUZRBISTNZJ75GP/Fedoraproject
Am I Vulnerable?
Check your domain or package.json for CVE-2022-41721 exposure.
Vulnerability Details
CVSS Base Score
7.5/ 10
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published Date
Jan 13, 2023
Last Modified
Apr 4, 2025
Need Manual Validation?
Automated scanners flag false positives. Get a manual pentest validation for this CVE.