CVE-2021-44716: Golang.org/x/net/http2 Golang.org/x/net/http2 Allows Uncontrolled Memory Consumption Vulnerability

HIGH
Advisory Identifier: GHSA-vc3p-29h2-gpcp
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CVSS 7.5
CWE-400
Published
Advisory Summary

CVE-2021-44716 is a HIGH (CVSS 7.5) golang.org/x/net/http2 allows uncontrolled memory consumption vulnerability (CWE-400: Uncontrolled Resource Consumption) affecting Golang.org/x/net/http2 libraries in the Go ecosystem. The issue involves golang.org/x/net/http2 allows uncontrolled memory consumption. Remediation is available by upgrading affected packages to version 0.0.0-20211209124913-491a49abca63.

CVE-2021-44716 at a Glance

CVE Identifier CVE-2021-44716
GHSA Identifier GHSA-vc3p-29h2-gpcp
Severity HIGH
CVSS v3.1 Base Score 7.5
CWE Classification CWE-400: Uncontrolled Resource Consumption
Affected Product Golang.org/x/net/http2
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 7.5

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity None (I:N)
Availability High (A:H)

How to Fix CVE-2021-44716

To remediate this vulnerability, upgrade all affected Golang.org/x/net/http2 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

golang.org/x/net/http2 fixed: 0.0.0-20211209124913-491a49abca63 
Upgrade golang.org/x/net/http2 to 0.0.0-20211209124913-491a49abca63
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for golang.org/x/net/http2

How to Check if You Are Affected

To determine whether your application is affected by CVE-2021-44716, inspect your project dependencies for Golang.org/x/net/http2:

inspect dependencies for golang.org/x/net/http2

Analyze the terminal output to locate any version of Golang.org/x/net/http2 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 0.0.0-20211209124913-491a49abca63), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-400: Uncontrolled Resource Consumption, where the product does not properly control the allocation and maintenance of a limited resource. In Golang.org/x/net/http2, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

net/http in Go before 1.16.12 and 1.17.x before 1.17.5 allows uncontrolled memory consumption in the header canonicalization cache via HTTP/2 requests.

CVE-2021-44716 Affected Golang.org/x/net/http2 Versions

1 component(s)
Fixed Versions:
0.0.0-20211209124913-491a49abca63
Product / Package Ecosystem Affected Versions Fixed Version
golang.org/x/net/http2
golang/golang.org/x/net/http2
Go
< 0.0.0-20211209124913-491a49abca63
0.0.0-20211209124913-491a49abca63

References

NVD — CVE-2021-44716 NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-44716
go.dev/cl/369794 WEB
https://go.dev/cl/369794
go.dev/issue/50058 WEB
https://go.dev/issue/50058
groups.google.com/g/golang-announce/c... WEB
https://groups.google.com/g/golang-announce/c/hcmEScgc00k
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/01/msg00016.html
lists.debian.org/debian-lts-announce... WEB
https://lists.debian.org/debian-lts-announce/2022/01/msg00017.html
pkg.go.dev/vuln/go-2022-0288 WEB
https://pkg.go.dev/vuln/GO-2022-0288
Golang.org/x/net/http2 Security Information SECURITY
https://security.gentoo.org/glsa/202208-02
Golang.org/x/net/http2 Security Information SECURITY
https://security.netapp.com/advisory/ntap-20220121-0002

Frequently Asked Questions

What is CVE-2021-44716?
CVE-2021-44716 is a security vulnerability in Golang.org/x/net/http2 involving golang.org/x/net/http2 allows uncontrolled memory consumption under CWE-400: Uncontrolled Resource Consumption.
Which Golang.org/x/net/http2 versions are affected?
Affected versions include releases prior to 0.0.0-20211209124913-491a49abca63 across affected packages: golang.org/x/net/http2.
What version fixes CVE-2021-44716?
Upgrading to 0.0.0-20211209124913-491a49abca63 (or the latest patched release for your respective branch) resolves the vulnerability.
Is golang.org/x/net/http2 affected?
Yes, golang.org/x/net/http2 is affected in releases prior to 0.0.0-20211209124913-491a49abca63. Upgrade your dependency to 0.0.0-20211209124913-491a49abca63 or later.
What is the CVSS score of CVE-2021-44716?
CVE-2021-44716 has a CVSS v3.1 base score of 7.5 (HIGH) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
What CWE is associated with CVE-2021-44716?
CVE-2021-44716 is classified under CWE-400: Uncontrolled Resource Consumption (The product does not properly control the allocation and maintenance of a limited resource.).
How can I check Go dependencies for CVE-2021-44716?
Run the dependency tree command: 'inspect dependencies for golang.org/x/net/http2'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-vc3p-29h2-gpcp",
  "modified" : "2023-02-08T00:37:41Z",
  "published" : "2022-01-02T00:00:48Z",
  "aliases" : [ "CVE-2021-44716" ],
  "summary" : "golang.org/x/net/http2 allows uncontrolled memory consumption",
  "details" : "net/http in Go before 1.16.12 and 1.17.x before 1.17.5 allows uncontrolled memory consumption in the header canonicalization cache via HTTP/2 requests.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "golang.org/x/net/http2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "0.0.0-20211209124913-491a49abca63"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2021-44716"
  }, {
    "type" : "WEB",
    "url" : "https://go.dev/cl/369794"
  }, {
    "type" : "WEB",
    "url" : "https://go.dev/issue/50058"
  }, {
    "type" : "WEB",
    "url" : "https://groups.google.com/g/golang-announce/c/hcmEScgc00k"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/01/msg00016.html"
  }, {
    "type" : "WEB",
    "url" : "https://lists.debian.org/debian-lts-announce/2022/01/msg00017.html"
  }, {
    "type" : "WEB",
    "url" : "https://pkg.go.dev/vuln/GO-2022-0288"
  }, {
    "type" : "WEB",
    "url" : "https://security.gentoo.org/glsa/202208-02"
  }, {
    "type" : "WEB",
    "url" : "https://security.netapp.com/advisory/ntap-20220121-0002"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-400" ],
    "severity" : "HIGH",
    "github_reviewed" : true,
    "github_reviewed_at" : "2023-02-08T00:37:41Z",
    "nvd_published_at" : "2022-01-01T05:15:00Z"
  }
}