Stay updated on certificate-related infosec topics, including SSL/TLS, PKI, and digital certificate management for robust cyber security.
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Background for this topic.
Digital certificates are electronic documents that verify the ownership of a public cryptographic key by an individual, organization, or device. Issued by trusted Certificate Authorities (CAs) within a Public Key Infrastructure (PKI), certificates enable secure communication by confirming identities and supporting encryption protocols like TLS. They include information such as the subject’s name, public key, issuer, validity period, and digital signature from the CA.
Security concerns with certificates focus on risks like CA compromise or fraudulent issuance, which can allow attackers to impersonate legitimate entities and intercept or alter encrypted traffic. Expired or revoked certificates may cause connection failures or be exploited if clients do not properly validate them. Effective certificate lifecycle management—including timely renewal, revocation checking (via CRLs or OCSP), and monitoring for unauthorized certificates—is essential to maintaining trust and preventing man-in-the-middle attacks or unauthorized access.
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Cybersecurity researchers have attributed the April 2026 DigiCert security incident to a threat activity cluster dubbed CylindricalCanine
Pull the certificate off the flash of a Shark RV2320EDUS robot vacuum, and you can run root commands on other people's Shark vacuums across the same AWS region: watch the camera, drive the robot, read the map of the house, and take the Wi-Fi password in plaintext
Check Point has warned of active exploitation of a critical vulnerability impacting Remote Access VPN and Mobile Access deployments that are configured to use the deprecated IKEv1 key exchange protocol
Cybersecurity researchers have discovered a malicious NuGet package that masquerades as a C# software development kit for Sicoob, one of Brazil's largest cooperative financial systems, to siphon client IDs and PFX certificates
A newly identified supply chain attack targeting DAEMON Tools software has compromised its installers to serve a malicious payload, according to findings from Kaspersky
Cisco has announced patches to address four critical security flaws impacting Identity Services and Webex Services that could result in arbitrary code execution and allow an attacker to impersonate any user within the service
OpenAI revealed a GitHub Actions workflow used to sign its macOS apps led to the download of the malicious Axios library on March 31, but noted that no user data or internal system was compromised
Google has announced a new program in its Chrome browser to ensure that HTTPS certificates are secure against the future risk posed by quantum computers
Cloudflare has addressed a security vulnerability impacting its Automatic Certificate Management Environment (ACME) validation logic that made it possible to bypass security controls and access origin servers. "The vulnerability was rooted in how our edge network processed requests destined for the ACME HTTP-01 challenge path (/.well-known/acme-challenge/*)," the web infrastructure
Microsoft on Thursday disclosed that it revoked more than 200 certificates used by a threat actor it tracks as Vanilla Tempest to fraudulently sign malicious binaries in ransomware attacks
Cybersecurity researchers have shed light on a Chinese-speaking cybercrime group codenamed UAT-8099 that has been attributed to search engine optimization (SEO) fraud and theft of high-value credentials, configuration files, and certificate data. The attacks are designed to target Microsoft Internet Information Services (IIS) servers, with most of the infections reported in India, Thailand
A China-nexus threat actor known as UNC6384 has been attributed to a set of attacks targeting diplomats in Southeast Asia and other entities across the globe to advance Beijing's strategic interests
The Russian nation-state threat actor known as Secret Blizzard has been observed orchestrating a new cyber espionage campaign targeting foreign embassies located in Moscow by means of an adversary-in-the-middle (AitM) attack at the Internet Service Provider (ISP) level and delivering a custom malware dubbed ApolloShadow
ConnectWise has disclosed that it's planning to rotate the digital code signing certificates used to sign ScreenConnect, ConnectWise Automate, and ConnectWise remote monitoring and management (RMM) executables due to security concerns
Google has revealed that it will no longer trust digital certificates issued by Chunghwa Telecom and Netlock citing "patterns of concerning behavior observed over the past year." The changes are expected to be introduced in Chrome 139, which is scheduled for public release in early August 2025. The current major version is 137. The update will affect all Transport Layer Security (TLS)
The threat actors behind the Medusa ransomware-as-a-service (RaaS) operation have been observed using a malicious driver dubbed ABYSSWORKER as part of a bring your own vulnerable driver (BYOVD) attack designed to disable anti-malware tools
Browser maker Mozilla is urging users to update their Firefox instances to the latest version to avoid facing issues with using add-ons due to the impending expiration of a root certificate
The digital world is exploding. IoT devices are multiplying like rabbits, certificates are piling up faster than you can count, and compliance requirements are tightening by the day. Keeping up with it all can feel like trying to juggle chainsaws while riding a unicycle
Details have emerged about a now-patched security vulnerability that could allow a bypass of the Secure Boot mechanism in Unified Extensible Firmware Interface (UEFI) systems
A China-linked nation-state group called TAG-112 compromised Tibetan media and university websites in a new cyber espionage campaign designed to facilitate the delivery of the Cobalt Strike post-exploitation toolkit for follow-on information collection