No exploitation reportedFix available

CVE-2021-44716

No exploitation reported by the sources we read.

Published2022-01-01
Fixed in1.17.5 · 1.16.12
WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2022-01-0105:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2021-44716?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2021-44716?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Branch	Affected	Fixed in	Source
1.17	≥ 1.17.0, < 1.17.5	1.17.5	NVD · OSV
1.17	≥ 1.17.0-0, < 1.17.5	1.17.5	OSV
1.16	< 1.16.12	1.16.12	NVD · OSV

Debian debian linux

Branch	Affected	Fixed in	Source
9.0	= 9.0	no fix published	NVD

Netapp cloud insights telegraf

Branch	Affected	Fixed in	Source
—	all versions	no fix published	NVD

2 more products in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

delveAlmaLinux:8all versions · fixed in 1.6.0-1.module_el8.5.0+2604+960c7771
golangAlmaLinux:8all versions · fixed in 1.16.12-1.module_el8.5.0+2604+960c7771and 7 other packages
grafanaAlmaLinux:8all versions · fixed in 7.5.9-5.el8_5

Vendor advisories

ICSA-23-047-04 CISA1 known affected
Siemens Brownfield Connectivity Gateway
Brownfield Connectivity - Gateway
RHSA-2023:0408 Red Hat Product Security6 products fixed
Red Hat Security Advisory: OpenShift Virtualization 4.12.0 Images security update
RHSA-2023:0407 Red Hat Product Security6 products fixed
Red Hat Security Advisory: OpenShift Virtualization 4.12.0 RPMs security update
RHSA-2022:6526 Red Hat Product Security14 products fixed
Red Hat Security Advisory: OpenShift Virtualization 4.11.0 Images security and bug fix update
RHSA-2022:1372 Red Hat Product Security72 products fixed
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.10.0 enhancement, security & bug fix update
RHSA-2022:1361 Red Hat Product Security5 products fixed
Red Hat Security Advisory: Red Hat OpenShift Data Foundation 4.10.0 RPM security,enhancement&bugfix update

Full record on NVD

Fix

Update Go to 1.17.5 · 1.16.12
Vendor fix CISA ICSA-23-047-04 · 1 productUpdate to V1.11 or later version Contact customer support to obtain the update <https://support.industry.siemens.com/cs/de/de/view/109801700>
Vendor fix Red Hat Product Security RHSA-2023:0408 · 6 productsBefore applying this update, you must apply all previously released errata relevant to your system. To apply this update, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHSA-2023:0407 · 6 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHSA-2022:1372 · 72 productsFor details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Workaround from the vendor Red Hat Product Security RHSA-2023:0408 · 43 productsThis flaw can be mitigated by disabling HTTP/2. Setting the GODEBUG=http2server=0 environment variable before calling Serve will disable HTTP/2 unless it was manually configured through the golang.org/x/net/http2 package.

Advisories and patches

groups.google.comPatch · Vendor Advisory

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.17.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score4.0 %2026-10-22
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2022-01-01
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2021-44716?

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.

Is CVE-2021-44716 actively exploited?

Active exploitation of CVE-2021-44716 has not been confirmed. Its EPSS score was 4.0% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-44716?

CVE-2021-44716 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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