There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to
    execute arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a
    crafted SPF DNS record, because of incorrect sprintf usage in SPF_record_expand_data in spf_expand.c. The
    vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional
    configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2
    with Postfix; older versions of spfquery relied on libspf2) but most often is not. (CVE-2021-33912)

  - libspf2 before 1.2.11 has a heap-based buffer overflow that might allow remote attackers to execute
    arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a crafted SPF
    DNS record, because of SPF_record_expand_data in spf_expand.c. The amount of overflowed data depends on
    the relationship between the length of an entire domain name and the length of its leftmost label. The
    vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional
    configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2
    with Postfix; older versions of spfquery relied on libspf2) but most often is not. (CVE-2021-33913)

The remote Debian 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the dla-2890 advisory.

  - libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to     execute arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a     crafted SPF DNS record, because of incorrect sprintf usage in SPF_record_expand_data in spf_expand.c. The     vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional     configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2     with Postfix; older versions of spfquery relied on libspf2) but most often is not. (CVE-2021-33912)

  - libspf2 before 1.2.11 has a heap-based buffer overflow that might allow remote attackers to execute     arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a crafted SPF     DNS record, because of SPF_record_expand_data in spf_expand.c. The amount of overflowed data depends on     the relationship between the length of an entire domain name and the length of its leftmost label. The     vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional     configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2     with Postfix; older versions of spfquery relied on libspf2) but most often is not. (CVE-2021-33913)

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

The remote host is affected by the vulnerability described in GLSA-202401-22 (libspf2: Multiple vulnerabilities)

  - Stack buffer overflow in libspf2 versions below 1.2.11 when processing certain SPF macros can lead to     Denial of service and potentially code execution via malicious crafted SPF explanation messages.
    (CVE-2021-20314)

  - libspf2 before 1.2.11 has a four-byte heap-based buffer overflow that might allow remote attackers to     execute arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a     crafted SPF DNS record, because of incorrect sprintf usage in SPF_record_expand_data in spf_expand.c. The     vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional     configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2     with Postfix; older versions of spfquery relied on libspf2) but most often is not. (CVE-2021-33912)

  - libspf2 before 1.2.11 has a heap-based buffer overflow that might allow remote attackers to execute     arbitrary code (via an unauthenticated e-mail message from anywhere on the Internet) with a crafted SPF     DNS record, because of SPF_record_expand_data in spf_expand.c. The amount of overflowed data depends on     the relationship between the length of an entire domain name and the length of its leftmost label. The     vulnerable code may be part of the supply chain of a site's e-mail infrastructure (e.g., with additional     configuration, Exim can use libspf2; the Postfix web site links to unofficial patches for use of libspf2     with Postfix; older versions of spfquery relied on libspf2) but most often is not. (CVE-2021-33913)

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

The remote Ubuntu 16.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6584-2 advisory.

    USN-6584-1 fixed several vulnerabilities in Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. This update provides     the corresponding updates for CVE-2021-33912 and CVE-2021-33913 in Ubuntu 16.04 LTS.

    We apologize for the inconvenience.



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

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

The remote Ubuntu 16.04 ESM / 18.04 ESM / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-6584-1 advisory.

    Philipp Jeitner and Haya Shulman discovered that Libspf2 incorrectly handled certain inputs. If a user or     an automated system were tricked into opening a specially crafted input file, a remote attacker could     possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2021-20314)

    It was discovered that Libspf2 incorrectly handled certain inputs. If a user or an automated system were     tricked into opening a specially crafted input file, a remote attacker could possibly use this issue to     cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 18.04 LTS and

    Ubuntu 20.04 LTS. (CVE-2021-33912, CVE-2021-33913)

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

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

ID	Name	Product	Family	Published	Updated	Severity
424059	Alpine: libspf2: security update to 1.2.11-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	4/4/2025	7/2/2026	critical
424059	Alpine: libspf2: security update to 1.2.11-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	4/4/2025	7/2/2026	critical
156920	Debian DLA-2890-1 : libspf2 - LTS security update	Nessus	Debian Local Security Checks	1/21/2022	11/20/2023	critical
188051	GLSA-202401-22 : libspf2: Multiple vulnerabilities	Nessus	Gentoo Local Security Checks	1/15/2024	1/15/2024	critical
190854	Ubuntu 16.04 LTS : Libspf2 vulnerabilities (USN-6584-2)	Nessus	Ubuntu Local Security Checks	2/21/2024	9/3/2025	critical
188055	Ubuntu 16.04 ESM / 18.04 ESM / 20.04 LTS : Libspf2 vulnerabilities (USN-6584-1)	Nessus	Ubuntu Local Security Checks	1/15/2024	9/3/2025	critical

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