The remote Debian 10 / 11 host has packages installed that are affected by multiple vulnerabilities as referenced in the dsa-4963 advisory.

    Multiple vulnerabilities have been discovered in OpenSSL, a Secure Sockets Layer toolkit. CVE-2021-3711     John Ouyang reported a buffer overflow vulnerability in the SM2 decryption. An attacker able to present     SM2 content for decryption to an application can take advantage of this flaw to change application     behaviour or cause the application to crash (denial of service). CVE-2021-3712 Ingo Schwarze reported a     buffer overrun flaw when processing ASN.1 strings in the X509_aux_print() function, which can result in     denial of service. Additional details can be found in the upstream advisory:
    https://www.openssl.org/news/secadv/20210824.txt For the oldstable distribution (buster), these problems     have been fixed in version 1.1.1d-0+deb10u7. For the stable distribution (bullseye), these problems have     been fixed in version 1.1.1k-1+deb11u1. We recommend that you upgrade your openssl packages. For the     detailed security status of openssl please refer to its security tracker page at: https://security-     tracker.debian.org/tracker/openssl

Tenable has extracted the preceding description block directly from the Debian security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

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Debian DSA-4963-1 : openssl - security update

critical Nessus Plugin ID 152783

Version 1.8