Open5GS up to 2.7.5 AMF src/mme/esm-handler.c esm_handle_pdn_connectivity_request denial of service

CVSS Meta Temp Score
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Open5GS up to 2.7.5. This impacts the function esm_handle_pdn_connectivity_request of the file src/mme/esm-handler.c of the component AMF Component. Such manipulation leads to denial of service. This vulnerability is listed as CVE-2025-8800. The attack may be performed from remote. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Open5GS up to 2.7.5. It has been rated as problematic. Affected by this issue is the function esm_handle_pdn_connectivity_request of the file src/mme/esm-handler.c of the component AMF Component. The manipulation with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability.

The advisory is shared for download at github.com. The advisory contains:

The vulnerability in Open5GS <= v2.7.5 is caused by inadequate validation of NAS messages with unknown PDN types, allowing an attacker to send a crafted message that crashes the MME process. The MME is a critical core network node responsible for user access and mobility management. Its failure can directly trigger cascading failures in other dependent core components (e.g., AMF, SMF) due to disrupted signaling and session context, leading to a network-wide service impact. Current CVSS scoring lists Scope as “Unchanged” (S:U), suggesting the impact is isolated. However, in practice, the crash extends beyond the MME itself, causing systemic disruption across multiple network functions. The Scope should therefore be updated to “Changed” (S:C). Regarding Availability Impact, it is currently rated as “Low” (A:L). This rating assumes partial resource availability and no complete service outage. In reality, this vulnerability fully terminates all existing sessions and prevents any new registrations or connections. The outage persists after the attack until the affected core components are manually restarted or recovered, leaving critical resources entirely unavailable. This meets the definition of “High” (A:H) availability impact, as the attack can cause a complete denial of service with lasting effects.
This vulnerability is handled as CVE-2025-8800. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 2.7.6 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 701505102f514cbde2856cd2ebc9bedb7efc820d is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-24080). github.com is providing further details. VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 6.7
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.3
VulDB Temp Score: 5.1
VulDB Vector: 🔒
VulDB Reliability: 🔍

Researcher Base Score: 8.6
Researcher Vector: 🔒

NVD Base Score: 7.5
NVD Vector: 🔒

CNA Base Score: 5.3
CNA Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Open5GS 2.7.6
Patch: 701505102f514cbde2856cd2ebc9bedb7efc820d

Timelineinfo

08/09/2025 Advisory disclosed
08/09/2025 +0 days VulDB entry created
08/15/2025 +6 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 3980
Status: Confirmed
Confirmation: 🔒

CVE: CVE-2025-8800 (🔒)
GCVE (CVE): GCVE-0-2025-8800
GCVE (VulDB): GCVE-100-319328
EUVD: 🔒
Misc.: 🔒

Entryinfo

Created: 08/09/2025 07:55
Updated: 08/15/2025 11:37
Changes: 08/09/2025 07:55 (59), 08/10/2025 14:01 (30), 08/10/2025 16:03 (1), 08/15/2025 11:05 (13), 08/15/2025 11:08 (3), 08/15/2025 11:37 (12)
Complete: 🔍
Submitter: ZYC010101
Committer: ZYC010101
Cache ID: 216::103

Submitinfo

Accepted

  • Submit #626113: N/A Open5GS <= v2.7.5 Denial of Service (by ZYC010101)

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