The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - Issue summary: A TLS 1.3 connection using certificate compression can be forced to allocate a large buffer     before decompression without checking against the configured certificate size limit. Impact summary: An     attacker can cause per-connection memory allocations of up to approximately 22 MiB and extra CPU work,     potentially leading to service degradation or resource exhaustion (Denial of Service). In affected     configurations, the peer-supplied uncompressed certificate length from a CompressedCertificate message is     used to grow a heap buffer prior to decompression. This length is not bounded by the max_cert_list     setting, which otherwise constrains certificate message sizes. An attacker can exploit this to cause large     per-connection allocations followed by handshake failure. No memory corruption or information disclosure     occurs. This issue only affects builds where TLS 1.3 certificate compression is compiled in (i.e., not     OPENSSL_NO_COMP_ALG) and at least one compression algorithm (brotli, zlib, or zstd) is available, and     where the compression extension is negotiated. Both clients receiving a server CompressedCertificate and     servers in mutual TLS scenarios receiving a client CompressedCertificate are affected. Servers that do not     request client certificates are not vulnerable to client-initiated attacks. Users can mitigate this issue     by setting SSL_OP_NO_RX_CERTIFICATE_COMPRESSION to disable receiving compressed certificates. The FIPS     modules in 3.6, 3.5, 3.4 and 3.3 are not affected by this issue, as the TLS implementation is outside the     OpenSSL FIPS module boundary. OpenSSL 3.6, 3.5, 3.4 and 3.3 are vulnerable to this issue. OpenSSL 3.0,     1.1.1 and 1.0.2 are not affected by this issue. (CVE-2025-66199)

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Linux Distros Unpatched Vulnerability : CVE-2025-66199

medium Nessus Plugin ID 296771

Version 1.5