Caddy: HPACK Decoder CPU DoS via Malicious HTTP/2 Stream
CVE-2022-41723 Published on February 28, 2023
Denial of service via crafted HTTP/2 stream in net/http and golang.org/x/net
A maliciously crafted HTTP/2 stream could cause excessive CPU consumption in the HPACK decoder, sufficient to cause a denial of service from a small number of small requests.
Vulnerability Analysis
CVE-2022-41723 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Products Associated with CVE-2022-41723
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Affected Versions
Go standard library net/http:- Before 1.19.6 is affected.
- Version 1.20.0-0 and below 1.20.1 is affected.
- Before 0.7.0 is affected.
- Before 0.7.0 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.