CVE-2023-46239

Q: How do I fix CVE-2023-46239?

Upgrade quic-go to 0.37.3 or later.

Q: Is CVE-2023-46239 being actively exploited?

Not that we know of. CVE-2023-46239 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.77% is the estimated probability that it will be exploited in the next 30 days. That is higher than 52% of all scored CVEs.

Q: How severe is CVE-2023-46239?

CVE-2023-46239 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

Q: What does CVE-2023-46239 affect?

Published advisories record a fix for quic-go (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

HIGH

7.5

CVSS v3

NVD

Description

quic-go is an implementation of the QUIC protocol in Go. Starting in version 0.37.0 and prior to version 0.37.3, by serializing an ACK frame after the CRYTPO that allows a node to complete the handshake, a remote node could trigger a nil pointer dereference (leading to a panic) when the node attempted to drop the Handshake packet number space. An attacker can bring down a quic-go node with very minimal effort. Completing the QUIC handshake only requires sending and receiving a few packets. Version 0.37.3 contains a patch. Versions before 0.37.0 are not affected.

CWE-248 CWE-476NULL Pointer Dereference

How to fix

Remediation Available

quic-goNVD

Affected:>= 0.37.0, < 0.37.3Fixed in:0.37.3CVE-2023-46239derived from NVD

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

0.77%probability of exploitation in 30 days

52ndpercentile

Moderate risk: more likely to be exploited than 52% of all known CVEs.

References

Patch2

Release Notes1

github.com

Related Vulnerabilities

Other CWE-248 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2025-59538	High	7.5	8.3%	-	Fix
CVE-2021-37714	High	7.5	6.9%	-	Fix
CVE-2025-53366	Unscored	-	6.0%	-	-
CVE-2018-11466	Critical	9.8	4.0%	-	-
CVE-2025-59465	High	7.5	3.6%	-	Fix
CVE-2018-7852	High	7.5	3.6%	-	-

Common questions

How do I fix CVE-2023-46239?

Upgrade quic-go to 0.37.3 or later.

Is CVE-2023-46239 being actively exploited?

Not that we know of. CVE-2023-46239 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 0.77% is the estimated probability that it will be exploited in the next 30 days. That is higher than 52% of all scored CVEs.

How severe is CVE-2023-46239?

CVE-2023-46239 has a CVSS v3 base score of 7.5, rated high. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.

What does CVE-2023-46239 affect?

Published advisories record a fix for quic-go (NVD). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

Embed a live status badge for CVE-2023-46239

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.