How severe is CVE-2025-66786?

CVE-2025-66786 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-2025-66786 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-66786?

CVE-2025-66786 affects Openairinterface Oai-cn5g-amf. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-66786?

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.

Does CVE-2025-66786 have an EU (EUVD) identifier?

Yes. CVE-2025-66786 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1212.

When was CVE-2025-66786 published?

CVE-2025-66786 was published on 2026-01-07 and last updated on 2026-06-17.

CVE-2025-66786

CVE-2025-66786 is a high-severity vulnerability in Openairinterface Oai-cn5g-amf 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-20.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (24th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-1212
Weakness: CWE-20
Affected product: Openairinterface Oai-cn5g-amf
Published: 2026-01-07
Last modified: 2026-06-17

Description

OpenAirInterface CN5G AMF<=v2.0.1 There is a logical error when processing JSON format requests. Unauthorized remote attackers can send malicious JSON data to AMF's SBI interface to launch a denial-of-service attack.

Frequently asked questions

What is CVE-2025-66786?: OpenAirInterface CN5G AMF<=v2.0.1 There is a logical error when processing JSON format requests. Unauthorized remote attackers can send malicious JSON data to AMF's SBI interface to launch a denial-of-service attack.
How severe is CVE-2025-66786?: CVE-2025-66786 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-2025-66786 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (24th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-66786?: CVE-2025-66786 affects Openairinterface Oai-cn5g-amf. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-66786?: 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.
Does CVE-2025-66786 have an EU (EUVD) identifier?: Yes. CVE-2025-66786 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-1212.
When was CVE-2025-66786 published?: CVE-2025-66786 was published on 2026-01-07 and last updated on 2026-06-17.

References

https://github.com/swallele/Vulnerability/blob/main/Openairinterface/Dos/Json_Dos.md

Affected products (1)

cpe:2.3:a:openairinterface:oai-cn5g-amf:*:*:*:*:*:*:*:*

More vulnerabilities in Openairinterface Oai-cn5g-amf

CVE-2026-30079 — Critical (CVSS 9.8): In OpenAirInterface V2.2.0 AMF, Out of sequence messages causes incorrect state transition during UE registration…
CVE-2026-30080 — High (CVSS 7.5): OpenAirInterface v2.2.0 accepts Security Mode Complete without any integrity protection. Configuration has supported…
CVE-2026-30075 — High (CVSS 7.5): OpenAirInterface Version 2.2.0 has a Buffer Overflow vulnerability in processing UplinkNASTransport containing…
CVE-2026-30078 — High (CVSS 7.5): OpenAirInterface V2.2.0 AMF crashes when it receives an NGAP message with invalid procedure code or invalid PDU-type.…
CVE-2025-65805 — High (CVSS 7.5): OpenAirInterface CN5G AMF<=v2.1.9 has a buffer overflow vulnerability in processing NAS messages. Unauthorized remote…

All CVEs affecting Openairinterface Oai-cn5g-amf →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-48316 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48281 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48277 — Critical (CVSS 10.0): ColdFusion versions 2025.9, 2023.20 and earlier are affected by an Improper Input Validation vulnerability that could…
CVE-2026-48055 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download any video media. In versions 2.4.0 and…
CVE-2026-34910 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi OS…
CVE-2026-33587 — Critical (CVSS 10.0): Lack of user input sanitisation in Open Notebook v1.8.3 allows the application user to execute Python code (and…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →