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Vulnerability Details CVE-2021-23351

The package github.com/pires/go-proxyproto before 0.5.0 are vulnerable to Denial of Service (DoS) via the parseVersion1() function. The reader in this package is a default bufio.Reader wrapping a net.Conn. It will read from the connection until it finds a newline. Since no limits are implemented in the code, a deliberately malformed V1 header could be used to exhaust memory in a server process using this code - and create a DoS. This can be exploited by sending a stream starting with PROXY and continuing to send data (which does not contain a newline) until the target stops acknowledging. The risk here is small, because only trusted sources should be allowed to send proxy protocol headers.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.013
EPSS Ranking 79.2%
CVSS Severity
CVSS v3 Score 4.4
CVSS v2 Score 4.0
References
Products affected by CVE-2021-23351


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