Is CVE-2021-46828 in the CISA KEV catalog?

No. CVE-2021-46828 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-46828?

CVE-2021-46828 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-46828?

CVE-2021-46828 has an EPSS score of 2.09% (79th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-46828?

Upgrade libtirpc on debian 11 to 1.3.1-1+deb11u1 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2021-46828

HIGHEPSS 79th pctl

7.5

CVSS v3

NVD

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

libtirpcDebian

Fixed in:1.3.1-1+deb11u1CVE-2021-46828

Fixed in:1.3.2-2.1CVE-2021-46828

libtirpcUbuntu

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

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

libtirpc3Ubuntu

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

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

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

2.09%probability of exploitation in 30 days

79thpercentile

Elevated risk: more likely to be exploited than 79% of all known CVEs.

References

Third-Party Advisory4

Other references1

git.linux-nfs.org

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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 2025-05-05.