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Open5gsApplication

CVE-2025-15555

HIGH · 8.2 CVSS v3.1 Published 2026-02-04
Fix available
A fix is available. Upgrade to after 2.7.6 or later.
See remediation →
91/100
Remediation priority · Urgent
Public exploit Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
A security flaw has been discovered in Open5GS up to 2.7.6. Affected by this vulnerability is the function hss_ogs_diam_cx_mar_cb of the file src/hss/hss-cx-path.c of the component VoLTE Cx-Test. The manipulation of the argument OGS_KEY_LEN results in stack-based buffer overflow. The attack may be launched remotely. The patch is identified as 54dda041211098730221d0ae20a2f9f9173e7a21. A patch should be applied to remediate this issue.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis
How this class of weakness works · CWE-119

The program reads or writes outside the bounds of an allocated buffer, corrupting adjacent memory. With crafted input an attacker can overwrite control data and, with effort, redirect execution to their own code. Remediation ranges from bounds checking and safe library functions to compiler mitigations, usually alongside a careful audit of the surrounding code.

General guidance for the memory buffer bounds error class — the official description and references above are authoritative for this specific CVE. Want a bespoke review and a reviewed fix? Ask our team →

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Open5gsApplication
Affected:<= 2.7.6

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to a release after 2.7.6
Vendor patch github.com →
Recommended fix High confidence

Open5GS 2.7.7 or later (contains commit 54dda041211098730221d0ae20a2f9f9173e7a21 fix)

  1. 1. Identify current Open5GS version by checking installed package or running 'open5gs -v' or reviewing build configuration
  2. 2. Stop all Open5GS services to prevent runtime issues during upgrade: systemctl stop open5gs-* (or equivalent for your deployment)
  3. 3. Update to Open5GS version 2.7.7 or later which contains the security fix from commit 54dda041211098730221d0ae20a2f9f9173e7a21
  4. 4. For source installations: pull the latest code from the Open5GS repository which includes the fix
  5. 5. Rebuild and reinstall Open5GS with the patched source code
  6. 6. Verify the patch is applied by confirming the fix exists in src/hss/hss-cx-path.c (the OGS_KEY_LEN buffer overflow is addressed)
  7. 7. Restart Open5GS services and verify core network functions operate normally
  8. 8. Monitor logs for any anomalies related to HSS Cx messages or authentication procedures
Caveat Minor version upgrades in Open5GS typically maintain backward compatibility but always review release notes for any configuration or feature changes before upgrading production systems

Generated from the published advisory — verify against the referenced sources before acting.

We can identify the exact fixed release, upgrade, and verify it in staging — typical engagement from $3,200. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2025-15555 in production — separate from our analysis above.

No notes yet

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What this is

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What belongs here
  • Verified mitigations, workarounds, and config changes
  • Version or environment caveats, and links to real fixes
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