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PatchSiren cyber security CVE debrief

CVE-2025-55177 Meta Platforms CVE debrief

CVE-2025-55177 is a Meta Platforms WhatsApp incorrect authorization vulnerability that CISA added to the Known Exploited Vulnerabilities catalog on 2025-09-02. Because it is on the KEV catalog, defenders should treat it as actively important and prioritize vendor-guided mitigation and patching. The supplied corpus does not include a CVSS score or deeper technical impact details, so the safest response is to track the official vendor guidance and remediate within the CISA due date.

Vendor
Meta Platforms
Product
WhatsApp
CVSS
MEDIUM 5.4
CISA KEV
Listed
Original CVE published
2025-09-02
Original CVE updated
2025-09-02
Advisory published
2025-09-02
Advisory updated
2025-09-02

Who should care

Security teams, IT administrators, and users responsible for WhatsApp deployment or risk management should pay attention, especially where rapid remediation of KEV-listed issues is required.

Technical summary

The available official metadata identifies the issue as an incorrect authorization vulnerability in Meta Platforms WhatsApp. CISA classifies it as known exploited, which raises defensive urgency even though the supplied corpus does not provide a CVSS score, exploitation chain details, or a fuller impact description.

Defensive priority

Urgent. Treat as a high-priority remediation item because CISA lists it as known exploited and sets a due date of 2025-09-23.

Recommended defensive actions

  • Review the official WhatsApp security advisory referenced by CISA and apply the vendor's mitigation or update guidance as soon as it is available.
  • Prioritize remediation before the CISA KEV due date of 2025-09-23.
  • Track exposure to WhatsApp instances and remove or isolate any deployment that cannot be mitigated promptly.
  • Monitor security advisories and incident response channels for additional guidance tied to CVE-2025-55177.
  • Verify internal asset inventories so affected users or endpoints can be identified quickly.

Evidence notes

Facts in the supplied corpus: CVE-2025-55177 is titled as a Meta Platforms WhatsApp incorrect authorization vulnerability; it was published and modified on 2025-09-02; CISA added it to the Known Exploited Vulnerabilities catalog on 2025-09-02 with a remediation due date of 2025-09-23; the known ransomware campaign use field is Unknown; no CVSS score was supplied. The corpus also references official CVE and NVD records, but no additional technical detail was included here.

Sources and references

Verified primary and authoritative sources

  • CVE-2025-55177 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2025-55177

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

  • CVE-2025-55177 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2025-55177

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

  • CISA Known Exploited Vulnerabilities catalog

    Publisher, destination, and source semantics verified

    URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog

    Cybersecurity and Infrastructure Security Agency - Official CISA catalog of vulnerabilities known to be exploited in the wild.

Supplemental references

  • Source item URL

    Unverified legacy reference

    URL: https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json

    cisa_kev

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.