Tech Lead in Boston

Daniel Foster

Daniel Foster is Tech Lead at CulperSec in Boston. He contributes technical context to CulperSec articles about security, vulnerabilities, and technology operations.

Articles by Daniel Foster

Research, guidance, and technical perspectives published on the CulperSec blog.

Infrastructure engineer inspecting hypervisor servers after a compromised software update

September 7, 2026 · 9 min read

Virtualizor's trusted update became malware

A BGP hijack redirected Virtualizor update traffic and delivered malware to hypervisors. Operators need evidence, credential rotation, and clean rebuilds.

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IT administrator inspecting a print management server beside network printers

September 2, 2026 · 8 min read

PaperCut compromise can outlive the patch

PaperCut Release 3 closes an exploited RCE chain, but exposed servers still need evidence preservation, hunting, and rebuild decisions.

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Systems administrator reviewing mail server logs in a data center

September 2, 2026 · 9 min read

Zimbra patching needs a hunt

CVE-2026-73570 is under active exploitation. Zimbra teams need to identify the vulnerable configuration, upgrade, and investigate for compromise.

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July 20, 2026 · 8 min read

SonicWall SMA1000 zero-day: Patch, then prove the appliance is clean

How SMA1000 owners should patch CVE-2026-15409 and CVE-2026-15410, then verify the appliance was not used for internal access.

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July 14, 2026 · 11 min read

CMMC Phase II suspension: what SMB defense contractors should keep doing

The CMMC Phase II suspension pauses some third-party pressure, not CUI duties. Here is what SMB defense contractors should review and document.

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March 17, 2026 · 9 min read

What the recent Stryker incident teaches healthcare and medtech teams about cyber resilience

A practical lessons-learned look at the recent Stryker cyber incident, with concrete steps healthcare and medtech security teams can take to improve containment, continuity, and recovery.

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