In libtirpc before 1.3.3rc1, remote attackers could exhaust the file descriptors of a…
Priority MEDIUM 45CWE-755Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 3 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-835.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.03204 88th percentileScored 2026-11-07
Fix Partial Red Hat: 1 advisoryRed Hat: 3 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
CPE configurations NVD · 3
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:libtirpc_project:libtirpc:*:*:*:*:*:*:*:* | before 1.3.3 | Vulnerable | Libtirpc Project |
| cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* | 10.0 | Vulnerable | Debian |
| cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* | 11.0 | Vulnerable | Debian |
- cpe:2.3:a:libtirpc_project:libtirpc:*:*:*:*:*:*:*:* Versions before 1.3.3 Vulnerable ·Libtirpc Project
- cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:* Versions 10.0 Vulnerable ·Debian
- cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:* Versions 11.0 Vulnerable ·Debian
Remediation
Red Hat 1 advisory
- RHSA-2022:8400 Released 2022-11-15 · Red Hat rating Moderatelibtirpc security update
- Red Hat CodeReady Linux Builder (v. 9) libtirpc-devel-1.3.3-0.el9
- Red Hat Enterprise Linux BaseOS (v. 9) libtirpc-1.3.3-0.el9
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Out of support scope |
| Red Hat CodeReady Linux Builder (v. 9) | Fixed | RHSA-2022:8400 |
| Red Hat Enterprise Linux BaseOS (v. 8) | Fixed | — |
| Red Hat Enterprise Linux BaseOS (v. 9) | Fixed | RHSA-2022:8400 |
Timeline
- 2026-10-02 Threatist record created from CVE-2021-46828
- 2026-10-03 Alias added: GHSA-x62c-6mxr-74fh
References
Sources
- CVE-2021-46828 · CVE Program
- CVE-2021-46828 · NVD
- FIRST EPSS
- GHSA-x62c-6mxr-74fh · GitHub Advisory Database · CC BY 4.0
- CVE-2021-46828 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences