Vulnerability · 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.
Published Jul 20, 2022 · catalog updated Oct 14, 2026 · libtirpc project
Check if you run it
No confirmed exploitation is on record for CVE-2021-46828. EPSS is 3.20%. Act only if a listed version of libtirpc project is installed.
Gaps on this record
- No vendor fix or required action is stored. Compare the linked advisory before you change production.
- Severity
- High7.5
- Known exploitation
- Not in CISA/VulnCheck KEV
- EPSS
- 3.20%
- Remediation
- Advisory link
- Affected products
- cpe debian/debian linux · cpe libtirpc project/libtirpc
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.
Are you affected?
Enter the version you run. The result uses only the ranges stored on this record.
The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.
- cpe debian/debian linux10.0
- cpe debian/debian linux11.0
- cpe libtirpc project/libtirpcversion unspecified
How to fix CVE-2021-46828
Recommended remediation
A patch or advisory reference is linked. Open the original publisher for availability by product version.
Official advisories
What to do
Three questions, each answered from this record only. Confirm the vendor advisory before you patch.
Should you patch?
No confirmed exploitation is on record for CVE-2021-46828. EPSS is 3.20%. Act only if a listed version of libtirpc project is installed.
Which versions are affected?
Compare what you have installed with debian/debian linux 10.0; debian/debian linux 11.0. Compare the installed version with the linked vendor advisory before you change production.
What should an analyst verify?
CWE-755: Improper Handling of Exceptional Conditions; CWE-835: Infinite Loop. EPSS 3.20%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Jul 20, 2022 · NIST NVD
Detected
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.
Oct 14, 2026 · NIST NVD
Updated
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.
Sources
- CVE.orgVulnerability recordCVE-2021-46828
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2021-46828
30-day exploitation probability 3.2%
first.org - NIST NVDVulnerability recordCVE-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.
nvd.nist.gov
References
Freshness
Last verified in this catalog Oct 16, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.