CVE-2023-21529
Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
CVSS
8.8
High
EPSS
59.3%
p99
KEV
YES
Apr 13, 2026
Exploit Today
80
0-100
Published: Feb 14, 2023 · Last modified: Aug 19, 2026 · CWE-502
59.3%EPSS · 30 days62.1%
2026-09-162026-10-14
Product
Microsoft / Exchange Server
Vulnerability
Microsoft Exchange Server Deserialization of Untrusted Data Vulnerability
Added to KEV
Apr 13, 2026
Remediate by
Apr 27, 2026
Known ransomware use
Yes
Summary description
Microsoft Exchange Server contains a deserialization of untrusted data that allows an authenticated attacker to achieve remote code execution.
Required action
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Notes
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529 ; https://nvd.nist.gov/vuln/detail/CVE-2023-21529
Microsoft Exchange Server Remote Code Execution Vulnerability
- msrc.microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529
- msrc.microsoft.comhttps://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-21529
- www.cisa.govhttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2023-21529
- www.microsoft.comhttps://www.microsoft.com/en-us/security/blog/2026/04/06/storm-1175-focuses-gaze-on-vulnerable-web-facing-assets-in-high-tempo-medusa-ransomware-operations/
CVECVSSEPSSKEVRExploitTitleMod.
CVE-2026-47218——
———runwasi facilitates running Wasm and WASI workloads managed by containerd. Prior to 0.6.1, containerd-shim-wasmtime-v1 can treat Wasmtime precompiled bytes supplied directly in an OCI image layer as a trusted artifact from the precompile-cache path and deserialize them as native code. An attacker who causes a victim to run a crafted image can bypass WebAssembly validation and execute native code in the shim zygote process, gaining the filesystem, environment, credentials, networking, and Linux syscall access available to the workload container. Downstream shims built with runwasi's containerd-shim-wasm precompile-cache API are also affected if they implement Compiler and trust executable precompiled artifacts from OCI image layers; the 0.6.1 boundary applies specifically to containerd-shim-wasmtime and does not independently certify downstream product releases. The flaw escapes the WASI sandbox to the workload container boundary, but it does not by itself bypass container isolation or provide direct host code execution. This issue is fixed in version 0.6.1.1hCVE-2026-1111607.5 HIG—
———LightLLM through 1.2.0 contains a denial of service vulnerability that allows unauthenticated attackers to crash the inference worker by supplying the internal pd_kv_trans_params field to the /generate endpoint. Attackers can send a single request whose parameters cause pickle.loads to fail in InferSamplingParams, killing the inference thread while /health stays up and all later requests hang until restart.1hCVE-2026-1108746.6 MED—
———Dolibarr before 23.0.4 contains a PHP object injection vulnerability in jsonOrUnserialize() in functions.lib.php, which calls unserialize() without class restrictions when json_decode() fails. Attackers able to write stored extrafields, export configurations or blocked log entries can plant serialized objects that trigger gadget chains for code execution or file manipulation.1hCVE-2026-1108129.9 CRI—
———Deserialization of untrusted data in the Gremlin graph data import component in Amazon Neptune engine might allow an authenticated remote actor with standard database permissions to execute arbitrary code and access internal service credentials.
To remediate this issue, users not enrolled in auto-update should upgrade to Amazon Neptune engine version 1.5.0.0.(Backports to 1.4.8.1 and 1.4.7.1)1hCVE-2026-1110948.1 HIG—
———In JetBrains TeamCity before 2026.2,
2026.1.4,
2025.11.8 remote code execution via a whitelist bypass in the build messages protocol was possible3hCVE-2026-471689.1 CRI—
———EspoCRM is an open source customer relationship management application. Prior to 9.3.7, an authenticated administrator can supply crafted serialized PHP object data that is stored in background MassAction or Export parameters and later deserialized by the application. The deserialization paths do not restrict allowed classes, allowing attacker-controlled object instantiation and arbitrary code execution on the server. This issue is fixed in version 9.3.7.5h