CVE-2021-46828

HIGHEPSS 86th pctl

7.5

CVSS v3

Description

In libtirpc before 1.3.3rc1, remote attackers could exhaust the file descriptors of a process that uses libtirpc because idle TCP connections are mishandled. This can, in turn, lead to an svc_run infinite loop without accepting new connections.

CWE-755 CWE-835

How to fix

Remediation Available

libtirpcAmazon

Fixed in:0:1.3.3-0.amzn2023

libtirpc-debuginfoAmazon

Fixed in:0:1.3.3-0.amzn2023

libtirpc-debugsourceAmazon

Fixed in:0:1.3.3-0.amzn2023

libtirpc-develAmazon

Fixed in:0:1.3.3-0.amzn2023

libtirpcDebian

Fixed in:1.3.2-2.1CVE-2021-46828

libtirpcUbuntu

Fixed in:1.2.5-1ubuntu0.1USN-5538-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:1.3.2-2ubuntu0.1USN-5538-1

libtirpc3Ubuntu

Fixed in:1.2.5-1ubuntu0.1USN-5538-1

This Ubuntu release reached end-of-life on 2025-05-31. Extended security maintenance is available until 2030-04-02.

Fixed in:1.3.2-2ubuntu0.1USN-5538-1

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

2.78%probability of exploitation in 30 days

86thpercentile

Elevated risk: more likely to be exploited than 86% of all known CVEs.

References

Third-Party Advisory4

Other references1

git.linux-nfs.org

Related Vulnerabilities

Other CWE-755 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2017-5638	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-7247	Critical	9.8	99%	KEV	Fix
CVE-2023-36933	High	7.5	72%	-	Fix
CVE-2018-0934	High	7.5	66%	-	Fix
CVE-2019-14287	High	8.8	64%	-	Fix
CVE-2019-12815	Critical	9.8	58%	-	Fix

Common questions

How do I fix CVE-2021-46828?

Published advisories record a fix for 7 affected products. The "How to fix" section on this page lists the fixed version and source advisory for each one, so apply the entry matching what you actually run.

Is CVE-2021-46828 being actively exploited?

Not that we know of. CVE-2021-46828 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 2.8% is the estimated probability that it will be exploited in the next 30 days. That is higher than 86% of all scored CVEs.

How severe is CVE-2021-46828?

CVE-2021-46828 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-2021-46828 affect?

Published advisories record a fix for libtirpc (Amazon), libtirpc-debuginfo (Amazon), libtirpc-debugsource (Amazon), libtirpc-devel (Amazon), and 3 more. Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.

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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 2026-06-17.