Security readout for executives and security teams
Plain-English summary
CVE-2021-44108 is a denial-of-service flaw in Open5GS 2.3.6 and earlier. A remote attacker could crash or disrupt the AMF component by sending a malformed SBI request. Business impact is service availability risk for deployments using affected Open5GS core network software.
Executive priority
Treat this as a moderate availability issue. It is most urgent for production 5G core environments using Open5GS where AMF disruption could affect subscriber registration or service continuity.
Technical view
The CVE describes a null pointer dereference in src/amf/namf-handler.c. The affected path is the AMF handling of SBI requests. Public sources identify Open5GS 2.3.6 and earlier and reference an upstream issue plus a corrective commit, but provide no CVSS score or CWE classification.
Likely exposure
Exposure is likely limited to organizations running Open5GS 2.3.6 or earlier, especially where AMF SBI interfaces are reachable beyond trusted core-network components.
Exploitation context
The sources describe remote denial of service via a crafted SBI request. CISA KEV is false in the provided bundle, and no cited source states active exploitation.
Researcher notes
Evidence is concise but consistent: CVE description, upstream issue, and commit all point to an AMF null pointer dereference. The public bundle lacks CVSS, exploit maturity, package release mapping, and detailed affected CPE data.
Mitigation direction
- Identify all Open5GS deployments and record exact versions.
- Prioritize systems running Open5GS 2.3.6 or earlier.
- Review Open5GS guidance and apply the fix associated with the cited commit.
- Restrict AMF SBI access to trusted network peers only.
- Monitor AMF availability and crash events until remediation is complete.
Validation and detection
- Confirm whether Open5GS is deployed in the environment.
- Check whether deployed versions are 2.3.6 or earlier.
- Verify the cited upstream fix is present in source or packaged builds.
- Review AMF logs for crashes or abnormal restarts.
- Validate SBI interfaces are not exposed to untrusted networks.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-44108 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/open5gs/open5gs/issues/1247CVE reference · x_refsource_MISC
- https://github.com/open5gs/open5gs/commit/d919b2744cd05abae043490f0a3dd1946c1ccb8cCVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.