#dos

Citrix has released security updates to address a critical flaw affecting NetScaler ADC that it said has been exploited in the wild. The vulnerability, tracked as CVE-2025-6543, carries a CVSS score of 9.2 out of a maximum of 10.0. It has been described as a case of memory overflow that could result in unintended control flow and denial-of-service. However, successful exploitation requires the

As attackers continue to evolve, Microsoft is committed to staying ahead by not only responding to vulnerabilities, but also by anticipating and mitigating entire classes of threats. One such threat, filesystem redirection attacks, has been a persistent vector for privilege escalation. In response, we’ve developed and deployed a new mitigation in Windows 11 called RedirectionGuard.

What happens in the privacy of your own home stays there. Or does it?

View CSAF 1. EXECUTIVE SUMMARY CVSS v4 7.1 ATTENTION: Exploitable remotely/low attack complexity Vendor: Schneider Electric Equipment: Modicon Controllers Vulnerabilities: Improper Input Validation, Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'), Uncontrolled Resource Consumption 2. RISK EVALUATION Successful exploitation of these vulnerabilities could allow an attacker to execute arbitrary code on the device or cause a denial-of-service condition. 3. TECHNICAL DETAILS 3.1 AFFECTED PRODUCTS Schneider Electric reports that the following products are affected: Modicon Controllers M241: Versions prior to 5.3.12.51 Modicon Controllers M251: Versions prior to 5.3.12.51 Modicon Controllers M262: Versions prior to 5.3.9.18 (CVE-2025-3898, CVE-2025-3117) Modicon Controllers M258: All versions (CVE-2025-3905, CVE-2025-3116, CVE-2025-3117) Modicon Controllers LMC058: All versions (CVE-2025-3905, CVE-2025-3116, CVE-2025-3117) 3.2 VULNERABILITY OVERVIEW 3.2.1 ...

### Impact The connection limiter is implemented incorrectly. It allows an arbitrary amount of simultaneously incoming connections (TCP, UDP and Unix socket) for the services `letmeind` and `letmeinfwd`. Therefore, the command line option `num-connections` is not effective and does not limit the number of simultaneously incoming connections. `letmeind` is the public network facing daemon (TCP/UDP). `letmeinfwd` is the internal firewall daemon that only listens on local Unix socket. Possible Denial Of Service by resource exhaustion. ### Affected versions All versions `<= 10.2.0` are affected. ### Patches All users shall upgrade to version `10.2.1`. ### Workarounds Untested possible workarounds: - It might be possible to limit the number of active connections to the `letmeind` port (default 5800) via firewall. - The resource consumption of the service might be restricted with a service manager such as systemd. ### Severity: If a (D)DoS is run against the service, *something* is...

A new FS-ISAC and Akamai report warns that sophisticated DDoS attacks are severely impacting the global financial sector, leading to multi-day outages. Learn about these evolving threats and how institutions can strengthen defences.

Cloudflare on Thursday said it autonomously blocked the largest ever distributed denial-of-service (DDoS) attack ever recorded, which hit a peak of 7.3 terabits per second (Tbps). The attack, which was detected in mid-May 2025, targeted an unnamed hosting provider. "Hosting providers and critical Internet infrastructure have increasingly become targets of DDoS attacks," Cloudflare's Omer

### Impact _What kind of vulnerability is it? Who is impacted?_ This is an advisory for a **potential polynomial Regular Expression Denial of Service (ReDoS)** vulnerability in the `RegexCriterion` class. This class compiles and evaluates an unvalidated, user-supplied regular expression against the identifier of an `Identifiable` object via `Pattern.compile(regex).matcher(id).find()`. To trigger **polynomial ReDoS** in `RegexCriterion`, **two attacker-controlled conditions** must be met: - **Control over the regex input** passed into the constructor: - _Example:_ An attacker supplies a malicious pattern such as `(.*a){10000}`. - **Control or influence over the output of `Identifiable.getId()`**: - _Example:_ A long string like `"aaaa...!"` that forces excessive backtracking. If both conditions are satisfied, a malicious actor can cause **significant CPU exhaustion** through repeated or recursive `filter(...)` calls — especially if performed over large network models or filterin...

### Impact _What kind of vulnerability is it? Who is impacted?_ This is an advisory for a **potential polynomial Regular Expression Denial of Service (ReDoS)** vulnerability in the PowSyBl's DataSource mechanism. When the `listNames(String regex)` method is called on a DataSource, the user-supplied regular expression (which may be unvalidated) is compiled and evaluated against a collection of file-like resource names. To trigger a **polynomial ReDoS** via this mechanism, **two attacker-controlled conditions** must be met: - **Control over the regex input** passed into `listNames(String regex)`. - _Example:_ An attacker supplies a malicious pattern like `(.*a){10000}`. - **Control or influence over the file/resource names** being matched. - _Example:_ Filenames such as `"aaaa...!"` that induce regex engine backtracking. If both conditions are satisfied, a malicious actor can cause **significant CPU consumption** due to regex backtracking — even with polynomial patterns. Since bot...

A denial of service (DoS) vulnerability has been identified in the JavaScript library microlight version 0.0.7. This library, used for syntax highlighting, does not limit the size of textual content it processes in HTML elements with the microlight class. When excessively large content (e.g., 100 million characters) is processed, the reset function in microlight.js consumes excessive memory and CPU resources, causing browser crashes or unresponsiveness. An attacker can exploit this vulnerability by tricking a user into visiting a malicious web page containing a microlight element with large content, resulting in a denial of service.