CVE-2018-4878A use-after-free vulnerability was discovered in Adobe Flash Player before 28.0.0.161.
Updated under an hour ago ()
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It affects adobe flash_player and 3 other products. Add what you run to find out whether that includes you.
CISA lists it as known exploited since Nov 3, 2021; federal agencies had to remediate by May 3, 2022, and it is known to be used in ransomware. Treat that date as your deadline.
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A use-after-free vulnerability was discovered in Adobe Flash Player before 28.0.0.161. This vulnerability occurs due to a dangling pointer in the Primetime SDK related to media player handling of listener objects. A successful attack can lead to arbitrary code execution. This was exploited in the wild in January and February 2018.
- CVSS
- 7.8 HIGH (v3.1, CISA ADP)CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- Weakness (CWE)
- CWE-416
- Known exploited
- Added to CISA KEV Nov 3, 2021; federal remediation due May 3, 2022; known ransomware useThe impacted product is end-of-life and should be disconnected if still in use.
- EPSS (exploitation in the next 30 days)
- 89.53% (percentile 100)
- Assigned by
- adobe
- NVD analysis
- Analyzed
- Record last updated
- Nov 17, 2025
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
adobe flash_player adobe:flash_player | before 28.0.0.161; before 28.0.0.161; before 28.0.0.161; before 28.0.0.161 | NVD |
redhat enterprise_linux_desktop redhat:enterprise_linux_desktop | 6.0 | NVD |
redhat enterprise_linux_server redhat:enterprise_linux_server | 6.0 | NVD |
redhat enterprise_linux_workstation redhat:enterprise_linux_workstation | 6.0 | NVD |
References
- http://blog.talosintelligence.com/2018/02/group-123-goes-wild.htmlx-refsource-misc, technical-description, third-party-advisory
- https://threatpost.com/adobe-flash-player-zero-day-spotted-in-the-wild/129742/x-refsource-misc, third-party-advisory
- https://helpx.adobe.com/security/products/flash-player/apsb18-03.htmlx-refsource-misc, vendor-advisory
- https://access.redhat.com/errata/RHSA-2018:0285vendor-advisory, x-refsource-redhat, third-party-advisory
- http://www.securitytracker.com/id/1040318vdb-entry, x-refsource-sectrack, broken-link
- http://www.securityfocus.com/bid/102893vdb-entry, x-refsource-bid, broken-link
- https://www.fireeye.com/blog/threat-research/2018/02/attacks-leveraging-adobe-zero-day.htmlx-refsource-misc, third-party-advisory
- https://blog.morphisec.com/flash-exploit-cve-2018-4878-spotted-in-the-wild-massive-malspam-campaignx-refsource-misc, third-party-advisory
- https://www.darkreading.com/threat-intelligence/adobe-flash-vulnerability-reappears-in-malicious-word-files/d/d-id/1331139x-refsource-misc, press/media-coverage, third-party-advisory
- https://github.com/InQuest/malware-samples/tree/master/CVE-2018-4878-Adobe-Flash-DRM-UAF-0dayx-refsource-misc, third-party-advisory
- https://www.trendmicro.com/vinfo/us/security/news/vulnerabilities-and-exploits/north-korean-hackers-allegedly-exploit-adobe-flash-player-vulnerability-cve-2018-4878-against-south-korean-targetsx-refsource-misc, technical-description, third-party-advisory
- https://github.com/vysec/CVE-2018-4878x-refsource-misc, third-party-advisory
- https://securingtomorrow.mcafee.com/mcafee-labs/hackers-bypassed-adobe-flash-protection-mechanism/x-refsource-misc, exploit, third-party-advisory
- https://www.exploit-db.com/exploits/44412/exploit, x-refsource-exploit-db, third-party-advisory, vdb-entry
- https://github.com/cisagov/vulnrichment/issues/196issue-tracking
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2018-4878third-party-advisory, us-government-resource
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.