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PatchSiren cyber security CVE debrief

CVE-2018-4878 Adobe CVE debrief

CVE-2018-4878 is a use-after-free vulnerability in Adobe Flash Player. CISA lists it in the Known Exploited Vulnerabilities catalog and notes known ransomware campaign use. The CISA record also says the impacted product is end-of-life and should be disconnected if it is still in use.

Vendor
Adobe
Product
Flash Player
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

Security teams, asset owners, and vulnerability managers responsible for any legacy Adobe Flash Player deployments or systems that still depend on Flash content. Incident responders should also treat remaining exposure as especially urgent because CISA classifies this CVE as known exploited and associated with ransomware campaign use.

Technical summary

The vulnerability is described in the supplied records as a use-after-free flaw affecting Adobe Flash Player. The CISA KEV entry identifies the issue as actively exploited and adds an operational directive: the impacted product is end-of-life and should be disconnected if still present in an environment. No CVSS score was supplied in the source corpus.

Defensive priority

Urgent. This is a CISA KEV-listed vulnerability affecting an end-of-life product, with known ransomware campaign use recorded in the source data.

Recommended defensive actions

  • Find any remaining Adobe Flash Player installations or dependencies across endpoints, servers, and legacy applications.
  • Disconnect or isolate impacted systems if Flash Player is still in use, per the CISA KEV guidance.
  • Retire or replace any business process that still depends on Flash content, since the product is end-of-life.
  • Track the CVE as a KEV-listed issue in remediation workflows and confirm it is treated as closed only after Flash is fully removed or disconnected.
  • Review legacy-system exposure carefully, especially where unsupported software may still be reachable or operational.

Evidence notes

The briefing is based only on the supplied CISA KEV source item and official CVE/NVD links. The CISA record identifies Adobe Flash Player as the vendor/product, marks the vulnerability as known exploited, records known ransomware campaign use as 'Known,' and states that the impacted product is end-of-life and should be disconnected if still in use. No CVSS score was included in the provided data.

Sources and references

Verified primary and authoritative sources

  • CVE-2018-4878 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2018-4878

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

  • CVE-2018-4878 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2018-4878

    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.