Elastic says its investigation found no evidence that Elastic Defend had the alleged zero-day enabling EDR bypass and remote code execution. The claim came from AshES Cybersecurity; Elastic disputes it and says the submitted proof of concept did not demonstrate a new security vulnerability. The technical explanation below is Elastic’s account, not an independent reproduction.
What was claimed—and what Elastic concluded
Elastic said its Information Security team learned on August 16, 2025, of a blog post and social media posts alleging a vulnerability in Elastic Defend. In a response first posted August 18 and updated through August 29, the company said its Security Engineering team could not reproduce the reports and found no evidence of an EDR-monitoring bypass or remote code execution. Elastic also said earlier submissions did not include reproducible exploit evidence.
BleepingComputer’s August 19 coverage attributed the allegation to AshES Cybersecurity. It described a claimed NULL pointer dereference in the elastic-endpoint-driver.sys kernel driver, which the researcher said could be used for EDR bypass, RCE and persistence. Those were the researcher’s claims, not independently confirmed findings. Elastic characterized the public disclosure as inconsistent with coordinated disclosure; that is the company’s position.
Elastic’s explanation of the crash reports and proof of concept
After the researcher provided crash dumps and a proof of concept (PoC) involving an executable and kernel driver, Elastic said the evidence involved two distinct issues.
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The earlier driver stability issue
Elastic said the crash dumps related to a known stability issue in the Elastic Defend driver for version 8.17.0. According to the company, a customer first reported it in April 2025, and fixes were released in versions 8.17.6, 8.18.1 and 9.0.1 on May 6, 2025. Elastic described the issue as an IRQL_NOT_LESS_OR_EQUAL bugcheck. It said the problem had been seen primarily when Trellix was present, but could occur with other third-party software or conditions. These dates, version details and cause are Elastic’s account.
Why Elastic said the PoC did not prove the alleged vulnerability
Elastic said the PoC did not reproduce that stability issue or demonstrate a new security vulnerability. Its explanation was that the PoC first used administrator rights to enable test signing, reboot the system and load a custom unsigned kernel driver. It then attempted to modify a non-writable memory region in Elastic’s kernel driver using ExAcquireFastMutex.
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According to Elastic, memory protections blocked the attempted write, triggering a separate ATTEMPTED_WRITE_TO_READONLY_MEMORY bugcheck. Elastic said the crash named its driver because the protected address was within that driver’s memory range, and described the crash as a PoC bug rather than a defect in Elastic Defend. This account explains the vendor’s interpretation; it does not constitute independent verification.
What Elastic advised Elastic Defend users to do
In its August 29, 2025 update, Elastic wrote: “For users of Elastic Defend, no action is required.” The company also recommended that users:
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- Keep up to date with release notes and apply available updates.
- Practice least privilege.
- Enable Secure Boot and Hypervisor-Protected Code Integrity (HVCI).
This reports Elastic’s advice in response to the claim; it is not an independent assurance about every installation or a statement about later events.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How to check for a confirmed Elastic vulnerability
Elastic’s product-security policy says the company publishes an Elastic Security Advisory (ESA) when a vulnerability is confirmed and resolved. It says advisories include affected versions, remediation or mitigation information and severity, and that Elastic assigns CVEs for vulnerabilities in Elastic-produced software. Elastic’s Trust Center says new advisories are announced in its Security Announcements forum, which also offers an RSS feed.
- Elastic Product Security: reporting policy and information about advisories.
- Elastic Security Announcements: the official announcement index.
- Elastic Trust Center FAQ: advisory and reporting information.
Elastic directs individuals seeking bounty consideration to its official HackerOne program; direct email reports are not eligible for a bounty. Customers and partners should use established direct channels. The reviewed public material does not establish whether the neutral third-party review Elastic said it would engage was completed or published, or whether a later update changed the company’s assessment.
Quick Recap
Sources and what they establish
- Elastic’s response to the blog claim, initially posted August 18, 2025, with updates through August 29, provides the company’s investigation, technical explanation and user guidance.
- BleepingComputer’s August 19, 2025 report identifies AshES Cybersecurity as the source of the public allegation and summarizes it.
- Elastic’s Security Announcements index lists the response on August 26, 2025.
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