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CVE-2026-25657 Ericsson CVE debrief

CVE-2026-25657 is a HIGH severity vulnerability in Ericsson Packet Core Gateway (PCG) versions prior to 1.30. An attacker can cause service degradation by continuously sending specially crafted messages. The impact persists as long as the attack continues, but the system recovers when the attack stops.

Vendor
Ericsson
Product
Packet Core Gateway
CVSS
HIGH 7.1
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-06-08
Advisory published
2026-06-05
Advisory updated
2026-06-08

Who should care

Administrators and security teams responsible for Ericsson Packet Core Gateway (PCG) versions prior to 1.30 should be aware of this vulnerability and take necessary actions to mitigate the risk.

Technical summary

The vulnerability is caused by Improper Handling of Syntactically Invalid Structure (CWE-228). An attacker can exploit this vulnerability by continuously sending specially crafted messages, leading to service degradation.

Defensive priority

HIGH

Recommended defensive actions

  • Upgrade to Ericsson Packet Core Gateway (PCG) version 1.30 or later.
  • Implement network monitoring and intrusion detection to identify and block suspicious traffic.
  • Restrict access to the Ericsson Packet Core Gateway (PCG) to only trusted sources.

Evidence notes

The CVE-2026-25657 vulnerability was published on [cvePublishedAt] and modified on [cveModifiedAt]. The CVSS score is 7.1, indicating a HIGH severity vulnerability.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-25657 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-25657

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-25657 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-25657

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • Mitigation or vendor reference

    Unverified legacy reference

    URL: https://www.ericsson.com/en/about-us/security/psirt/cve-2026-25657

    85b1779b-6ecd-4f52-bcc5-73eac4659dcf - Vendor Advisory

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.