{"vulnerability": "CVE-2021-21341", "sightings": [{"uuid": "a8dd8479-9525-4074-b932-d66e51441368", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21341", "type": "seen", "source": "https://t.me/cibsecurity/25265", "content": "\u203c CVE-2021-21341 \u203c\n\nXStream is a Java library to serialize objects to XML and back again. In XStream before version 1.4.16, there is vulnerability which may allow a remote attacker to allocate 100% CPU time on the target system depending on CPU type or parallel execution of such a payload resulting in a denial of service only by manipulating the processed input stream. No user is affected who followed the recommendation to setup XStream's security framework with a whitelist limited to the minimal required types. If you rely on XStream's default blacklist of the Security Framework, you will have to use at least version 1.4.16.\n\n\ud83d\udcd6 Read\n\nvia \"National Vulnerability Database\".", "creation_timestamp": "2021-03-23T06:37:50.000000Z"}, {"uuid": "d40c84be-9ab6-4556-a24c-811f2bbce5b3", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21341", "type": "published-proof-of-concept", "source": "https://t.me/CyberSecurityTechnologies/2917", "content": "#Threat_Research\nDocumented Vulnerabilities in XStream + Workarounds\n(PoCs for CVE-2021-21341-21351, CVE-2020-26217, CVE-2020-26258, CVE-2020-26259, CVE-2017-7957, CVE-2016-3674, CVE-2013-7285)\nhttp://x-stream.github.io/security.html", "creation_timestamp": "2021-03-16T11:01:03.000000Z"}, {"uuid": "ed4c64f5-7387-46a2-981d-db187e13f41d", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21341", "type": "seen", "source": "https://t.me/cissp/2547", "content": "Threat_Research\nDocumented Vulnerabilities in XStream + Workarounds\n(PoCs for CVE-2021-21341-21351, CVE-2020-26217, CVE-2020-26258, CVE-2020-26259, CVE-2017-7957, CVE-2016-3674, CVE-2013-7285)\nhttp://x-stream.github.io/security.html\n\nVM Detection Tricks\nPart 1 - Physical memory resource maps\nhttps://labs.nettitude.com/blog/vm-detection-tricks-part-1-physical-memory-resource-maps\nPart 2 - Driver Thread Fingerprinting\nhttps://labs.nettitude.com/blog/vm-detection-tricks-part-2-driver-thread-fingerprinting\n]-> HyperV Driver Thread Detection PoC:\nhttps://github.com/nettitude/hyperv-driver-thread-detection-poc\n\nWhitepaper\n\"Kusarigama: Demonstrating non-modular chained attacks for malware persistence\", 2020.\nhttps://github.com/vxunderground/VXUG-Papers/tree/main/The%20Persistence%20Series/Kusarigama", "creation_timestamp": "2026-09-01T17:00:58.690399Z"}, {"uuid": "31d2bcf6-7afa-4cfc-8ec6-9fcaab3c3a29", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-21341", "type": "seen", "source": "https://t.me/cissp/2547", "content": "Threat_Research\nDocumented Vulnerabilities in XStream + Workarounds\n(PoCs for CVE-2021-21341-21351, CVE-2020-26217, CVE-2020-26258, CVE-2020-26259, CVE-2017-7957, CVE-2016-3674, CVE-2013-7285)\nhttp://x-stream.github.io/security.html\n\nVM Detection Tricks\nPart 1 - Physical memory resource maps\nhttps://labs.nettitude.com/blog/vm-detection-tricks-part-1-physical-memory-resource-maps\nPart 2 - Driver Thread Fingerprinting\nhttps://labs.nettitude.com/blog/vm-detection-tricks-part-2-driver-thread-fingerprinting\n]-> HyperV Driver Thread Detection PoC:\nhttps://github.com/nettitude/hyperv-driver-thread-detection-poc\n\nWhitepaper\n\"Kusarigama: Demonstrating non-modular chained attacks for malware persistence\", 2020.\nhttps://github.com/vxunderground/VXUG-Papers/tree/main/The%20Persistence%20Series/Kusarigama", "creation_timestamp": "2026-09-02T01:04:49.389179Z"}]}