How severe is CVE-2021-46828?

CVE-2021-46828 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2021-46828 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-46828?

CVE-2021-46828 primarily affects Libtirpc Project Libtirpc. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-46828?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-46828 published?

CVE-2021-46828 was published on 2022-07-20 and last updated on 2026-06-17.

CVE-2021-46828

CVE-2021-46828 is a high-severity vulnerability in Libtirpc Project Libtirpc with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-755.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 2% (79th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-755
Affected product: Libtirpc Project Libtirpc
Published: 2022-07-20
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-46828?: 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.
How severe is CVE-2021-46828?: CVE-2021-46828 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2021-46828 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (79th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-46828?: CVE-2021-46828 primarily affects Libtirpc Project Libtirpc. In total, 3 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-46828?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-46828 published?: CVE-2021-46828 was published on 2022-07-20 and last updated on 2026-06-17.

References

Affected products (3)

cpe:2.3:a:libtirpc_project:libtirpc:*:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

More vulnerabilities in Libtirpc Project Libtirpc

CVE-2018-14622 — High (CVSS 7.5): A null-pointer dereference vulnerability was found in libtirpc before version 0.3.3-rc3. The return value of…
CVE-2017-8779 — High (CVSS 7.5): rpcbind through 0.2.4, LIBTIRPC through 1.0.1 and 1.0.2-rc through 1.0.2-rc3, and NTIRPC through 1.4.3 do not consider…
CVE-2018-14621 — Medium (CVSS 5.3): An infinite loop vulnerability was found in libtirpc before version 1.0.2-rc2. With the port to using poll rather than…
CVE-2013-1950 — Medium (CVSS 4.3): The svc_dg_getargs function in libtirpc 0.2.3 and earlier allows remote attackers to cause a denial of service (rpcbind…

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