CVE-2025-15686Public exploitNetwork attack vector

HSS crash via valueless Session-Id AVP

Published Aug 12, 2026 · Updated Aug 12, 2026

Denial of service in Open5GS HSS 2.7.0 through 2.7.6 allows remote authenticated users to crash the service via a malformed ULR. An invalid Update-Location-Request supplies a Session-Id AVP without a value, and fd_msg_sess_get asserts on that absent value and aborts the HSS process. The sender must first establish an SCTP connection and complete Diameter CER registration; the demonstrated consequence is an HSS crash.

CVSS severity4.3
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Open5GS HSS 2.7.0 through 2.7.6 allows remote authenticated users to crash the service via a malformed ULR. An invalid Update-Location-Request supplies a Session-Id AVP without a value, and fd_msg_sess_get asserts on that absent value and aborts the HSS process. The sender must first establish an SCTP connection and complete Diameter CER registration; the demonstrated consequence is an HSS crash.

The record

CVE
CVE-2025-15686
Published
Aug 12, 2026
Updated
Aug 12, 2026
Vendor
Open5GS
Product
Open5GS
Classifications
CWE-404, T1499
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 12, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 12, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.7.0
  2. Affected versionversion=2.7.1
  3. Affected versionversion=2.7.2
  4. Affected versionversion=2.7.3
  5. Affected versionversion=2.7.4
  6. Affected versionversion=2.7.5
  7. Affected versionversion=2.7.6

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Open5GS · Open5GSversion=2.7.0; version=2.7.1; version=2.7.2; version=2.7.3; version=2.7.4; version=2.7.5; version=2.7.6

Published CVSS scores

4.3NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
4.0NVDAV:N/AC:L/Au:S/C:N/I:N/A:P
5.3VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-404Improper Resource Shutdown or Release
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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