Vulnerabilities

Citrix NetScaler ADC and NetScaler Gateway contain an authentication-bypass vulnerability (CWE-288, 'using an alternate path or channel') that an unauthenticated remote threat actor can exploit. The flaw is triggerable when the appliance is configured as an AAA virtual server or as a Gateway, including SSL VPN, ICA Proxy, CVPN, or RDP Proxy deployments, allowing the attacker to bypass authentication without valid credentials. A successful bypass could give an attacker access to VPN-protected or AAA-gated resources as an authenticated user; no CVSS score has been published yet. Organizations running affected NetScaler appliances in these configurations are exposed, and affected version ranges are not specified in the available data, so defenders should consult Citrix advisory AL26-019. The flaw was added to CISA's KEV on 2026-09-09, indicating exploitation in the wild; ransomware use is unknown, no public PoC is known, and EPSS assigns a 3.4% probability of exploitation within 30 days (88th percentile).

Do: Prioritize applying vendor fixes or mitigations per Citrix advisory AL26-019 in line with CISA BOD 26-04, focusing first on internet-facing appliances configured as AAA virtual servers or Gateways (SSL VPN, ICA Proxy, CVPN, RDP Proxy). Until patched, restrict internet exposure and review VPN/AAA authentication logs for signs of unauthenticated access, following CISA's Forensics Triage Requirements if compromise is suspected.

CVE-2026-53362 is an out-of-bounds write (CWE-787) in the Linux kernel's IPv6 output path: __ip6_append_data() mis-accounts fraggap bytes on the paged-allocation branch, leaving the new skb's linear area undersized so the copy of carried-over fragment-gap data spills past skb->end into the trailing skb_shared_info. An unprivileged local user can trigger the corruption by sending over a UDPv6 socket using MSG_MORE combined with MSG_SPLICE_PAGES; the bad accounting was introduced by commit 773ba4fe9104 ('ipv6: avoid partial copy for zc') and became triggerable when commit ce650a166335 allowed the MSG_SPLICE_PAGES case to proceed instead of returning -EINVAL. Successful triggering causes kernel memory corruption that, per the high confidentiality/integrity/availability scores, can lead to loss of data confidentiality, integrity and availability — potentially local privilege escalation or a system crash. Any Linux system running a kernel with the affected code is exposed; the source data provides no specific affected version numbers, only the introducing and trigger commits. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-08-27, indicating known in-the-wild exploitation (ransomware use unknown), with EPSS at 0.5% and no public PoC known.

Do: Apply the kernel fix per vendor instructions: upgrade to Linux kernel builds containing the fraggap-accounting resolution for __ip6_append_data(), following CISA's BOD 26-04 patching requirements (for cloud services, follow BOD guidance or discontinue use if mitigations are unavailable); no fixed version numbers were provided in the source data, so confirm with your distribution/vendor that the fix commit is included. Until patched, prioritize multi-user hosts and systems where untrusted local users can open UDPv6 sockets, since exploitation requires local unprivileged access with MSG_MORE and MSG_SPLICE_PAGES. Track KEV-required remediation deadlines, as the flaw is cataloged as exploited in the wild (added 2026-08-27).

CVE-2026-8452 is a memory buffer overflow (CWE-119) in Citrix NetScaler ADC and NetScaler Gateway that applies when the appliance is configured as a Gateway (SSL VPN, ICA Proxy, CVPN, or RDP Proxy) or as an AAA virtual server. The flaw is reachable over the network without authentication (CVSS 4.0: AV:N/PR:N), so an unauthenticated attacker can trigger it remotely. Successful exploitation causes unpredictable or erroneous appliance behavior and denial of service, and the high confidentiality score suggests possible disclosure of memory contents; some reporting suggests pre-authentication remote code execution may be possible, though the vendor description emphasizes DoS. Organizations running affected NetScaler appliances in a Gateway or AAA role — a very common configuration for remote access to Citrix virtual apps and desktops — are potentially exposed. The flaw was added to CISA's KEV catalog on 2026-08-26 and is reported as exploited in the wild, with headlines noting the flaw was already patched before exploitation was confirmed.

Do: Upgrade NetScaler ADC and Gateway to the fixed releases identified in Citrix security advisory AV26-645 (Update 3); no fixed version numbers were included in this data, so consult the advisory directly. Prioritize any appliance with an internet-exposed Gateway (SSL VPN, ICA Proxy, CVPN, RDP Proxy) or AAA virtual server, and given the KEV listing and reports of exploitation, perform log and forensics review for signs of prior compromise per CISA's Forensics Triage Requirements — federal agencies must comply with BOD 26-04 timelines. Where patching cannot happen immediately, restrict or disable exposed Gateway/AAA configurations as an interim mitigation.

Kludex Starlette prior to version 1.0.1 did not validate the HTTP Host request header before using it to reconstruct request.url, an inconsistency classified as HTTP request/response smuggling (CWE-444). Because routing operates on the raw ASGI scope path while request.url is rebuilt from the unvalidated Host header, an attacker can send a malformed Host header so that request.url.path differs from the path the router actually processed. Any middleware or endpoint that enforces security restrictions based on request.url rather than the raw scope path can then be tricked into approving requests that should have been blocked, bypassing those controls. All Starlette deployments below 1.0.1 are affected, both direct users and downstream products that bundle the library, including Red Hat offerings such as Ansible Automation Platform, OpenShift AI, OpenShift Lightspeed, Satellite, AI Inference Server, Migration Toolkit for Applications, and Enterprise Linux AI. CISA added the flaw to the Known Exploited Vulnerabilities catalog on 2026-09-02, confirming active exploitation; related reporting describes attackers deploying reverse shells and crypto miners, and EPSS ranks it in the 98th percentile with a 36.3% probability of exploitation within 30 days.

Do: Upgrade Starlette to 1.0.1 or later, which validates the Host header against RFC 9112/RFC 3986 grammar and falls back to scope['server'] for malformed values, and apply the corresponding Red Hat updates for each bundled product listed above. Until patched, review middleware and endpoints that enforce security decisions from request.url and validate or pin the Host header at your reverse proxy or load balancer. As a KEV entry, federal agencies must patch per BOD 26-04 timelines based on each asset's internet exposure, and operators of internet-facing AI infrastructure should verify their Starlette/FastAPI dependency versions.

CVE-2025-67038 is an OS command injection flaw (CWE-78) in the HTTP RPC module of Lantronix EDS5000 series device servers, with firmware 2.1.0.0R3 confirmed affected. When a login attempt fails, the module writes a log entry by building a shell command that directly concatenates the username from the request without any sanitization, so an attacker who sends a crafted username in an authentication request gets their commands appended to it. Because the log-writing command runs as root, an unauthenticated, network-reachable attacker gains full command execution with the highest privileges on the device. Any organization running network-exposed Lantronix EDS5000 device/console servers (EDS5008, EDS5016, EDS5032, and the G526/G527-series variants) is affected. CISA added the flaw to its Known Exploited Vulnerabilities catalog on 2026-06-23 and reports it is being actively exploited; the EPSS score of 19.3% (97th percentile) reflects a high near-term exploitation risk.

Do: Upgrade EDS5000-series firmware to a patched release per Lantronix's guidance, since no fixed version is specified in the available data and 2.1.0.0R3 is confirmed vulnerable; if patching is not yet possible, restrict HTTP access to the device's management interface at the network level. Federal agencies must apply vendor mitigations per CISA BOD 26-04 requirements following the 2026-06-23 KEV listing. Check device logs and configs for signs of compromise, since successful injection yields root-level command execution.

KNX Association KNX devices configured with Connection Authorization Option 1 can be locked out by an attacker because the BCU key (the device password) typically cannot be removed without entering the current password (CWE-645, an overly restrictive lockout mechanism). An attacker with access to the network used by the KNX installation can connect, purge all devices that lack additional security options, and set a BCU key; an attacker with physical access can do the same even on non-networked devices. The result is loss of availability: legitimate users are locked out of the device and often cannot reset it themselves (CVSS 7.5, availability impact only). Any deployment of KNX devices using the Connection Authorization Option 1 feature is affected; no specific firmware version ranges were published in the available data. CISA added the issue to its Known Exploited Vulnerabilities catalog on 2026-07-15, confirming exploitation in the wild, though no public proof-of-concept is known and ransomware use is unknown.

Do: Per CISA's KEV listing and BOD 26-04 requirements, apply mitigations in line with vendor instructions: inventory KNX devices using Connection Authorization Option 1, restrict network access to KNXnet/IP interfaces and remote-access paths, and keep a documented copy of any BCU keys so devices can be unlocked. Review whether the connection authorization feature can be disabled or replaced with vendor-recommended more secure options; if mitigations are unavailable, follow BOD 26-04 guidance, including discontinuing use of internet-reachable KNX interfaces.

CVE-2022-0995 is an out-of-bounds (OOB) memory write in the Linux kernel's watch_queue event notification subsystem (CWE-787) that can overwrite parts of kernel state. A local user can trigger it through the watch_queue interface, for example by supplying a crafted event filter definition, causing the kernel to write beyond allocated memory when event notifications are processed. Successful exploitation may allow the local user to gain privileged (kernel/root) access or crash the system, yielding high impact on confidentiality, integrity, and availability (CVSS 3.1: 7.8, local attack vector). Affected systems include mainstream Linux kernels (Fedora is explicitly listed) and NetApp HCI appliance firmware products that ship the affected kernel. The flaw is confirmed exploited in the wild: CISA added it to the Known Exploited Vulnerabilities catalog on 2026-08-26, two public proof-of-concepts are available, and EPSS puts 30-day exploitation probability at 9.5% (95th percentile), though ransomware use is unconfirmed.

Do: Apply updated kernels from your distribution or vendor (Fedora kernel updates; NetApp fixes are delivered via the HCI firmware updates in its security advisory) and prioritize internet-exposed, multi-user hosts per CISA BOD 26-04, including the required forensics triage checks. Because exploitation requires local access, restrict untrusted local code execution and shell access on unpatched systems, and hunt for signs of local privilege escalation on high-exposure hosts. After remediation, verify the patched kernel package is installed and that the running kernel has actually been booted into the fixed version.

Ajax.NET Professional (distributed as the ajaxpro.2 package) is vulnerable to insecure deserialization (CWE-502): it deserializes arbitrary .NET classes supplied by the client without validating which types may be instantiated. Because AjaxPro exposes HTTP endpoints for browser-to-server AJAX calls, a remote, unauthenticated attacker can send a crafted serialized payload to any reachable AjaxPro endpoint and abuse .NET deserialization gadget chains to execute code on the server. Successful exploitation yields full remote code execution with high impact on confidentiality, integrity, and availability (CVSS 3.1 score of 9.8, network vector, no privileges or user interaction required). Any application running any version of ajaxpro.2 / Ajax.NET Professional is affected; the provided data specifies no fixed version, so defenders must rely on vendor guidance for patched releases. The flaw was added to CISA's Known Exploited Vulnerabilities catalog on 2026-08-26, carries an EPSS 30-day exploitation probability of 83.6%, has public PoC code available, and Talos Intelligence reporting links it to the Chinese-speaking threat actor UAT-10147, which deploys the SPECTRE malware with an EDR bypass and a Linux rootkit in post-compromise operations.

Do: Inventory your ASP.NET estate for AjaxPro usage (web.config references, AjaxPro HTTP handlers) and prioritize any internet-facing instance for remediation. Upgrade ajaxpro.2 to the latest vendor release per vendor instructions — the provided data specifies no fixed version — or, if patching is not immediately possible, restrict or block access to AjaxPro endpoints from the internet. Because the flaw is on CISA's KEV under BOD 26-04, apply mitigations within the required timeline and hunt exposed servers for post-compromise tooling, as Talos reports UAT-10147 deploying SPECTRE with an EDR bypass and a Linux rootkit.