The remote Alibaba Cloud Linux 3 host has packages installed that are affected by multiple vulnerabilities as referenced in the ALINUX3-SA-2021:0047 advisory.

    Package updates are available for Alibaba Cloud Linux 3 that fix the following vulnerabilities:

    CVE-2021-3516:
    There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted     file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to     confidentiality, integrity, and availability.

    CVE-2021-3517:
    There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker     who is able to supply a crafted file to be processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to     application availability, with some potential impact to confidentiality and integrity if an attacker is     able to use memory information to further exploit the application.

    CVE-2021-3518:
    There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to     be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact     from this flaw is to confidentiality, integrity, and availability.

    CVE-2021-3537:
    A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to crash the application. The highest threat from this     vulnerability is to system availability.

    CVE-2021-3541:
    A flaw was found in libxml2. Exponential entity expansion attack its possible bypassing all existing     protection mechanisms and leading to denial of service.

Tenable has extracted the preceding description block directly from the Alibaba Cloud Linux 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 CentOS Linux 9 host has packages installed that are affected by multiple vulnerabilities as referenced in the libxml2-2.9.12-4.el9 build changelog.

  - xmlSchemaPreRun in xmlschemas.c in libxml2 2.9.10 allows an xmlSchemaValidateStream memory leak.
    (CVE-2019-20388)

  - GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at     libxml2/entities.c. The issue has been fixed in commit 50f06b3e. (CVE-2020-24977)

  - xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file     situation. (CVE-2020-7595)

  - There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted     file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to     confidentiality, integrity, and availability. (CVE-2021-3516)

  - There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker     who is able to supply a crafted file to be processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to     application availability, with some potential impact to confidentiality and integrity if an attacker is     able to use memory information to further exploit the application. (CVE-2021-3517)

  - There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to     be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact     from this flaw is to confidentiality, integrity, and availability. (CVE-2021-3518)

  - A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to crash the application. The highest threat from this     vulnerability is to system availability. (CVE-2021-3537)

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

The version of Oracle (formerly Sun) Java SE or Java for Business installed on the remote host is prior to 7 Update 321, 8 Update 311, 11 Update 13, or 17 Update 1. It is, therefore, affected by multiple vulnerabilities as referenced in the October 2021 CPU advisory:

  - Vulnerability in the Java SE product of Oracle Java SE (component: JavaFX (libxml)). The supported version that is     affected is Java SE: 8u301. Easily exploitable vulnerability allows unauthenticated attacker with network access     via multiple protocols to compromise Java SE. Successful attacks of this vulnerability can result in unauthorized     ability to cause a hang or frequently repeatable crash (complete DOS) of Java SE as well as unauthorized update,     insert or delete access to some of Java SE accessible data and unauthorized read access to a subset of Java SE     accessible data. This vulnerability applies to Java deployments, typically in clients running sandboxed Java Web     Start applications or sandboxed Java applets, that load and run untrusted code (e.g., code that comes from the     internet) and rely on the Java sandbox for security. This vulnerability does not apply to Java deployments,     typically in servers, that load and run only trusted code (e.g., code installed by an administrator).     (CVE-2021-3517)

  - Vulnerability in the Java SE product of Oracle Java SE (component: Deployment). The supported version that is     affected is Java SE: 8u301. Difficult to exploit vulnerability allows unauthenticated attacker with network access     via multiple protocols to compromise Java SE. Successful attacks require human interaction from a person other than     the attacker. Successful attacks of this vulnerability can result in takeover of Java SE. This vulnerability     applies to Java deployments, typically in clients running sandboxed Java Web Start applications or sandboxed Java     applets, that load and run untrusted code (e.g., code that comes from the internet) and rely on the Java sandbox for     security. This vulnerability does not apply to Java deployments, typically in servers, that load and run only trusted     code (e.g., code installed by an administrator). (CVE-2021-35560)

  - Vulnerability in the Java SE, Oracle GraalVM Enterprise Edition product of Oracle Java SE (component: Libraries).     Supported versions that are affected are Java SE: 8u301, 11.0.12, 17; Oracle GraalVM Enterprise Edition: 20.3.3 and     21.2.0. Easily exploitable vulnerability allows low privileged attacker with network access via Kerberos to     compromise Java SE, Oracle GraalVM Enterprise Edition. Successful attacks require human interaction from a person     other than the attacker and while the vulnerability is in Java SE, Oracle GraalVM Enterprise Edition, attacks may     significantly impact additional products. Successful attacks of this vulnerability can result in unauthorized access     to critical data or complete access to all Java SE, Oracle GraalVM Enterprise Edition accessible data.     (CVE-2021-35567)

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

An update of the libxml2 package has been released.

The remote SUSE Linux SLES11 host has packages installed that are affected by multiple vulnerabilities as referenced in the SUSE-SU-2021:14729-1 advisory.

  - The xmlParserHandlePEReference function in parser.c in libxml2 before 2.9.2, as used in Web Listener in     Oracle HTTP Server in Oracle Fusion Middleware 11.1.1.7.0, 12.1.2.0, and 12.1.3.0 and other products,     loads external parameter entities regardless of whether entity substitution or validation is enabled,     which allows remote attackers to cause a denial of service (resource consumption) via a crafted XML     document. (CVE-2014-0191)

  - xmlParseBalancedChunkMemoryRecover in parser.c in libxml2 before 2.9.10 has a memory leak related to     newDoc->oldNs. (CVE-2019-19956)

  - xmlSchemaPreRun in xmlschemas.c in libxml2 2.9.10 allows an xmlSchemaValidateStream memory leak.
    (CVE-2019-20388)

  - GNOME project libxml2 v2.9.10 has a global buffer over-read vulnerability in xmlEncodeEntitiesInternal at     libxml2/entities.c. The issue has been fixed in commit 50f06b3e. (CVE-2020-24977)

  - xmlStringLenDecodeEntities in parser.c in libxml2 2.9.10 has an infinite loop in a certain end-of-file     situation. (CVE-2020-7595)

  - There's a flaw in libxml2's xmllint in versions before 2.9.11. An attacker who is able to submit a crafted     file to be processed by xmllint could trigger a use-after-free. The greatest impact of this flaw is to     confidentiality, integrity, and availability. (CVE-2021-3516)

  - There is a flaw in the xml entity encoding functionality of libxml2 in versions before 2.9.11. An attacker     who is able to supply a crafted file to be processed by an application linked with the affected     functionality of libxml2 could trigger an out-of-bounds read. The most likely impact of this flaw is to     application availability, with some potential impact to confidentiality and integrity if an attacker is     able to use memory information to further exploit the application. (CVE-2021-3517)

  - There's a flaw in libxml2 in versions before 2.9.11. An attacker who is able to submit a crafted file to     be processed by an application linked with libxml2 could trigger a use-after-free. The greatest impact     from this flaw is to confidentiality, integrity, and availability. (CVE-2021-3518)

  - A vulnerability found in libxml2 in versions before 2.9.11 shows that it did not propagate errors while     parsing XML mixed content, causing a NULL dereference. If an untrusted XML document was parsed in recovery     mode and post-validated, the flaw could be used to crash the application. The highest threat from this     vulnerability is to system availability. (CVE-2021-3537)

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

ID	Name	Product	Family	Published	Updated	Severity
236735	Alibaba Cloud Linux 3 : 0047: libxml2 (ALINUX3-SA-2021:0047)	Nessus	Alibaba Cloud Linux Local Security Checks	5/14/2025	5/14/2025	high
191152	CentOS 9 : libxml2-2.9.12-4.el9	Nessus	CentOS Local Security Checks	2/29/2024	4/26/2024	high
154344	Oracle Java SE 1.7.0_321 / 1.8.0_311 / 1.11.0_13 / 1.17.0_1 Multiple Vulnerabilities (October 2021 CPU)	Nessus	Windows	10/22/2021	12/20/2024	high
150240	Photon OS 3.0: Libxml2 PHSA-2021-3.0-0246	Nessus	PhotonOS Local Security Checks	6/4/2021	8/22/2025	high
150579	SUSE SLES11 Security Update : libxml2 (SUSE-SU-2021:14729-1)	Nessus	SuSE Local Security Checks	6/10/2021	12/26/2023	high

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