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.

NVD

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.

Exploitation:
NONE
Automatable:
YES
Technical Impact:
PARTIAL
Attack Vector:
NETWORK
Attack Complexity:
LOW
Privileges Required:
NONE
User Interaction:
NONE
Scope:
UNCHANGED
Confidentiality Impact:
NONE
Integrity Impact:
NONE
Availability Impact:
HIGH

Products Associated with CVE-2022-41723

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2022-41723 are published in these products:

GoLang Go
GoLang Http2
GoLang Hpack
Canonical Ubuntu Linux

Affected Versions

Go standard library net/http: golang.org/x/net/http2: golang.org/x/net/http2/hpack:

Exploit Probability

EPSS
4.56%
Percentile
91.66%

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.