CVE-2021-33197
golang: net/http/httputil: ReverseProxy forwards connection headers if first one is empty
Severity Score
5.3
*CVSS v3.1
Exploit Likelihood
*EPSS
Affected Versions
*CPE
Public Exploits
1
*Multiple Sources
Exploited in Wild
-
*KEV
Decision
-
*SSVC
Descriptions
In Go before 1.15.13 and 1.16.x before 1.16.5, some configurations of ReverseProxy (from net/http/httputil) result in a situation where an attacker is able to drop arbitrary headers.
En Go versiones anteriores a 1.15.13 y versiones 1.16.x anteriores a 1.16.5, algunas configuraciones de ReverseProxy (desde net/http/httputil) resultan en una situación en la que un atacante es capaz de dejar caer cabeceras arbitrarias
A flaw was found in Go, acting as an unintended proxy or intermediary, where ReverseProxy forwards connection headers if the first one was empty. This flaw allows an attacker to drop arbitrary headers. The highest threat from this vulnerability is to integrity.
*Credits:
N/A
CVSS Scores
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Attack Vector
Attack Complexity
Authentication
Confidentiality
Integrity
Availability
* Common Vulnerability Scoring System
SSVC
- Decision:-
Exploitation
Automatable
Tech. Impact
* Organization's Worst-case Scenario
Timeline
- 2021-05-19 CVE Reserved
- 2021-08-02 CVE Published
- 2024-04-17 EPSS Updated
- 2024-08-03 CVE Updated
- 2024-08-03 First Exploit
- ---------- Exploited in Wild
- ---------- KEV Due Date
CWE
- CWE-20: Improper Input Validation
- CWE-862: Missing Authorization
CAPEC
References (5)
| URL | Tag | Source |
|---|---|---|
| https://groups.google.com/g/golang-announce | Third Party Advisory |
| URL | Date | SRC |
|---|---|---|
| https://groups.google.com/g/golang-announce/c/RgCMkAEQjSI | 2024-08-03 |
| URL | Date | SRC |
|---|
| URL | Date | SRC |
|---|---|---|
| https://security.gentoo.org/glsa/202208-02 | 2022-09-14 | |
| https://access.redhat.com/security/cve/CVE-2021-33197 | 2022-11-15 | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1989570 | 2022-11-15 |
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" | < 1.15.13 Search vendor "Golang" for product "Go" and version " < 1.15.13" | - |
Affected
| ||||||
| Golang Search vendor "Golang" | Go Search vendor "Golang" for product "Go" | >= 1.16.0 < 1.16.5 Search vendor "Golang" for product "Go" and version " >= 1.16.0 < 1.16.5" | - |
Affected
| ||||||