Has exploited zero-day vulnerability CVE-2026-35273 against Oracle PeopleSoft application infrastructure.1
- Tactic
- Resource Development
- Platform
- PRE
- Version
- 1.0
- Created
- 01 October 2020
- Last modified
- 12 May 2026
Adversaries may develop exploits that can be used during targeting. An exploit takes advantage of a bug or vulnerability in order to cause unintended or unanticipated behavior to occur on computer hardware or software. Rather than finding/modifying exploits from online or purchasing them from exploit vendors, an adversary may develop their own exploits.[1] Adversaries may use information acquired via Vulnerabilities to focus exploit development efforts. As part of the exploit development process, adversaries may uncover exploitable vulnerabilities through methods such as fuzzing and patch analysis.[2]
Exploits MITRE reference T1587.004
4 groups have been recorded using this technique. Newest first; each entry carries MITRE’s procedure text and a link to the group’s full record. Click a name to filter the rules below.
Has used zero-day vulnerabilities CVE-2022-41328 against FortiOS and CVE-2023-20867 and CVE-2023-34048 against VMware vCenter.123
Has exploited zero-day vulnerabilities for initial access.1
Has rapidly transformed and adapted public exploit proof-of-concept code for new vulnerabilities and utilized them against target networks.1
All 4 groups for this technique
1 campaign has been recorded using this technique. Listed newest first; dates are year-granularity and attribution is MITRE’s.
During the Anthropic AI-orchestrated Campaign, the adversary used Claude Code to research exploitation techniques for an identified SSRF vulnerability, to generate a tailored custom attack payload, and to develop a full exploit chain prior to deployment.1
All 1 campaigns for this technique
Offense vs defense T1587.004
Is defensive coverage keeping up with adversary use? Eight counts, each ranked against all 697 ATT&CK techniques. Attack sits left, defense right, so a shape leaning left means adversaries are better documented here than defenders are equipped. Hover any spoke for its percentile and the share of techniques that have more. The timeline below shows when each side arrived.
Exploits detection strategy DET0894
MITRE names one behaviour worth catching for this technique and breaks it into 1 analytic, one per platform. Each carries the log sources it needs and the fields you tune per environment.
Detection of Exploits
AN2026 · PRE
Much of this activity will take place outside the visibility of the target organization, making detection of this behavior difficult. Detection efforts may be focused on behaviors relating to the use of exploits (i.e. Exploit Public-Facing Application, Exploitation for Client Execution, Exploitation for Privilege Escalation, Exploitation for Stealth, Exploitation for Credential Access, Exploitation of Remote Services, and Application or System Exploitation).
This technique cannot be easily mitigated with preventive controls since it is based on behaviors performed outside of the scope of enterprise defenses and controls.