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PatchSiren cyber security CVE debrief

CVE-2020-17496 vBulletin CVE debrief

CVE-2020-17496 is a vBulletin PHP module remote code execution vulnerability that CISA added to its Known Exploited Vulnerabilities catalog on 2021-11-03. That KEV listing means the issue is treated as known exploited and should be prioritized for remediation using vendor guidance. The available source material does not include a CVSS score or version scope, so defenders should rely on the official CVE, NVD, and CISA KEV records plus vendor instructions when planning response.

Vendor
vBulletin
Product
vBulletin
CVSS
Unknown
CISA KEV
Listed
Original CVE published
2021-11-03
Original CVE updated
2021-11-03
Advisory published
2021-11-03
Advisory updated
2021-11-03

Who should care

Administrators and security teams responsible for vBulletin deployments, especially internet-facing forum systems and any environment where vBulletin is publicly reachable or operationally important.

Technical summary

The official record identifies the issue as a remote code execution vulnerability in the vBulletin PHP module. CISA’s KEV entry marks it as a known exploited vulnerability and directs organizations to apply updates per vendor instructions. No additional technical detail, affected-version data, or CVSS score is provided in the supplied corpus.

Defensive priority

High. CISA has listed this CVE in the KEV catalog, so remediation should be treated as time-sensitive even though no CVSS score is included in the provided source data.

Recommended defensive actions

  • Identify all vBulletin instances and determine which are internet-facing or otherwise high exposure.
  • Apply vendor-recommended updates as directed by CISA’s KEV guidance.
  • Verify remediation by confirming installed versions and any vendor-provided fix status.
  • Review logs and surrounding activity on affected systems for signs of abuse or follow-on compromise.
  • If immediate patching is not possible, escalate the system for compensating controls and urgent change management until updates are applied.

Evidence notes

Evidence is limited to official and authoritative sources in the supplied corpus: CISA’s Known Exploited Vulnerabilities catalog entry, the CVE record, and the NVD detail page. The CISA KEV metadata shows vendorProject=vBulletin, product=vBulletin, dateAdded=2021-11-03, dueDate=2022-05-03, and requiredAction='Apply updates per vendor instructions.' No CVSS score or affected-version detail was supplied.

Sources and references

Verified primary and authoritative sources

  • CVE-2020-17496 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2020-17496

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

  • CVE-2020-17496 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2020-17496

    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.