5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.5 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
20.6%
A malicious HTTP sender can use chunk extensions to cause a receiver reading from a request or response body to read many more bytes from the network than are in the body. A malicious HTTP client can further exploit this to cause a server to automatically read a large amount of data (up to about 1GiB) when a handler fails to read the entire body of a request. Chunk extensions are a little-used HTTP feature which permit including additional metadata in a request or response body sent using the chunked encoding. The net/http chunked encoding reader discards this metadata. A sender can exploit this by inserting a large metadata segment with each byte transferred. The chunk reader now produces an error if the ratio of real body to encoded bytes grows too small.
[
{
"vendor": "Go standard library",
"product": "net/http/internal",
"collectionURL": "https://pkg.go.dev",
"packageName": "net/http/internal",
"versions": [
{
"version": "0",
"lessThan": "1.20.12",
"status": "affected",
"versionType": "semver"
},
{
"version": "1.21.0-0",
"lessThan": "1.21.5",
"status": "affected",
"versionType": "semver"
}
],
"programRoutines": [
{
"name": "chunkedReader.beginChunk"
},
{
"name": "readChunkLine"
},
{
"name": "chunkedReader.Read"
}
],
"defaultStatus": "unaffected"
}
]
5.3 Medium
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
LOW
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.5 Medium
AI Score
Confidence
High
0.001 Low
EPSS
Percentile
20.6%