No exploitation reportedFix available

CVE-2023-39322

Q: Is CVE-2023-39322 actively exploited?

Active exploitation of CVE-2023-39322 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-39322?

CVE-2023-39322 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.

No exploitation reported by the sources we read.

Published2023-09-08
Fixed in1.21.1
WeaknessCWE-770

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

QUIC connections do not set an upper bound on the amount of data buffered when reading post-handshake messages, allowing a malicious QUIC connection to cause unbounded memory growth. With fix, connections now consistently reject messages larger than 65KiB in size.

Timeline

dates in UTC

2023-09-0817:15CVE 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-2023-39322?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-39322?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV · CISA-ADP

Branch	Affected	Fixed in	Source
1.21	≥ 1.21.0, < 1.21.1	1.21.1	NVD · OSV
1.21	≥ 1.21.0-0, < 1.21.1	1.21.1	OSV

Go standard library crypto tls

Branch	Affected	Fixed in	Source
1.21	≥ 1.21.0-0, < 1.21.1	1.21.1	CISA-ADP

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

buildahAlmaLinux:9all versions · fixed in 1:1.31.3-2.el9_3and 1 other package
buildahAlmaLinux:8all versions · fixed in 1:1.24.6-7.module_el8.9.0+3627+db8ec155and 1 other package
buildah-testsAlmaLinux:8all versions · fixed in 1:1.24.6-7.module_el8.9.0+3687+dcd7ef8f
cockpit-podmanAlmaLinux:8all versions · fixed in 46-1.module_el8.7.0+3344+5bcd850f
conmonAlmaLinux:8all versions · fixed in 2:2.1.4-2.module_el8.9.0+3627+db8ec155
conmonAlmaLinux:8all versions · fixed in 2:2.1.4-2.module_el8.9.0+3687+dcd7ef8f
container-selinuxAlmaLinux:8all versions · fixed in 2:2.205.0-3.module_el8.9.0+3627+db8ec155
containernetworking-pluginsAlmaLinux:9all versions · fixed in 1:1.3.0-6.el9_3

23 more package ranges on OSV.dev

Vendor advisories

RHSA-2023:6840 Red Hat Product Security12 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.14.2 packages and security update
RHBA-2023:6863 Red Hat Product Security16 products fixed
Red Hat Bug Fix Advisory: LVMS 4.14.z Bug Fix and Enhancement update
RHSA-2023:6154 Red Hat Product Security2 products fixed
Red Hat Security Advisory: Secondary Scheduler Operator for Red Hat OpenShift 1.2.0
RHSA-2023:5009 Red Hat Product Security207 products fixed
Red Hat Security Advisory: OpenShift Container Platform 4.14.0 security update
RHSA-2023:6202 Red Hat Product Security191 products fixed
Red Hat Security Advisory: Red Hat Advanced Cluster Management 2.6.8 security and bug fix updates
RHSA-2023:6200 Red Hat Product Security152 products fixed
Red Hat Security Advisory: Multicluster Engine for Kubernetes 2.1.9 security updates and bug fixes

6 more advisories

Full record on NVD

Fix

Update Go to 1.21.1
Vendor fix Red Hat Product Security RHSA-2023:6840 · 12 productsFor OpenShift Container Platform 4.14 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.openshift.com/container-platform/4.14/release_notes/ocp-4-1…
Vendor fix Red Hat Product Security RHBA-2023:6863 · 16 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHSA-2023:6202 · 191 productsFor Red Hat Advanced Cluster Management for Kubernetes, see the following documentation for details on how to install the images: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.6/html/install/installing#installing-while-connected-online
Vendor fix Red Hat Product Security RHSA-2023:6200 · 152 productsFor multicluster engine for Kubernetes, see the following documentation for details on how to install the images: https://access.redhat.com/documentation/en-us/red_hat_advanced_cluster_management_for_kubernetes/2.6/html/multicluster_engine/multicluster_engine_overview#installing-while-connected-on…
Vendor fix Red Hat Product Security RHSA-2023:6115 · 3 productsFor details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Vendor fix Red Hat Product Security RHSA-2023:6085 · 54 productsFor details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258

Advisories and patches

go.devPatch
groups.google.comRelease Notes
pkg.go.devVendor Advisory

Detection

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

Sources

CISA-ADPSSVC decisionnone2024-09-26
OpenCVESSVC decisionnone—
NVDCVSS 3.17.5read 2026-10-23
NVDweakness (CWE)CWE-770read 2026-10-23
FIRST EPSSEPSS score1.3 %2026-10-23
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: 2023-09-08
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-39322?

Is CVE-2023-39322 actively exploited?

Active exploitation of CVE-2023-39322 has not been confirmed. Its EPSS score was 1.3% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-39322?

CVE-2023-39322 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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