// For flags

CVE-2021-31525

golang: net/http: panic in ReadRequest and ReadResponse when reading a very large header

Severity Score

5.9
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

0
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

net/http in Go before 1.15.12 and 1.16.x before 1.16.4 allows remote attackers to cause a denial of service (panic) via a large header to ReadRequest or ReadResponse. Server, Transport, and Client can each be affected in some configurations.

net/http en Go versiones anteriores a 1.15.12 y versiones 1.16.x anteriores a 1.16.4, permite a atacantes remotos causar una denegación de servicio (pánico) por medio de un encabezado grande en los parámetros ReadRequest o ReadResponse. El Servidor, el Transporte y el Cliente pueden estar afectados en algunas configuraciones

A vulnerability was detected in net/http of the Go standard library when parsing very large HTTP header values, causing a crash and subsequent denial of service. This vulnerability affects both clients and servers written in Go, however, servers are only vulnerable if the value of MaxHeaderBytes has been increased from the default.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Attack Vector
Network
Attack Complexity
High
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-04-21 CVE Reserved
  • 2021-05-27 CVE Published
  • 2024-02-10 EPSS Updated
  • 2024-08-03 CVE Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
  • ---------- First Exploit
CWE
  • CWE-120: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
  • CWE-674: Uncontrolled Recursion
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Golang
Search vendor "Golang"
 Go
Search vendor "Golang" for product "Go"
 < 1.15.12
Search vendor "Golang" for product "Go" and version " < 1.15.12"
-
Affected
Golang
Search vendor "Golang"
 Go
Search vendor "Golang" for product "Go"
 >= 1.16.0 < 1.16.4
Search vendor "Golang" for product "Go" and version " >= 1.16.0 < 1.16.4"
-
Affected
Fedoraproject
Search vendor "Fedoraproject"
 Fedora
Search vendor "Fedoraproject" for product "Fedora"
 34
Search vendor "Fedoraproject" for product "Fedora" and version "34"
-
Affected