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CVE-2021-3517

Quick assessment

Affected
n/a libxml2
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

libxml2是开源的一个用来解析XML文档的函数库。它用C语言写成，并且能为多种语言所调用，例如C语言，C++，XSH。 libxml2 中entities.c存在缓冲区错误漏洞，该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。

AI Predicted 5.3 Difficulty: Moderate EPSS 16.99% · P97
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I. Basic Information for CVE-2021-3517

Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
libxml2 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
libxml2是开源的一个用来解析XML文档的函数库。它用C语言写成，并且能为多种语言所调用，例如C语言，C++，XSH。 libxml2 中entities.c存在缓冲区错误漏洞，该漏洞源于网络系统或产品在内存上执行操作时，未正确验证数据边界，导致向关联的其他内存位置上执行了错误的读写操作。攻击者可利用该漏洞导致缓冲区溢出或堆溢出等。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
- libxml2 libxml2 2.9.11 -

II. Public POCs for CVE-2021-3517

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III. Intelligence Information for CVE-2021-3517

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Vendor Advisories for CVE-2021-3517 (8)

Mailing List Discussions for CVE-2021-3517 (5)

Same Patch Batch · n/a · 2021-05-19 · 20 CVEs total

CVE-2021-3421 Red Hat Package Manager 数据伪造问题漏洞
CVE-2021-20589 多款 Mitsubishi Electric 设备缓冲区错误漏洞
CVE-2021-21732 ZTE 手机 安全漏洞
CVE-2021-21733 ZXCDN 信息泄露漏洞
CVE-2020-20264 MikroTik RouterOS 数字错误漏洞
CVE-2020-20266 MikroTik RouterOS 代码问题漏洞
CVE-2017-17674 BMC Software BMC Remedy 9.1SP3 代码问题漏洞
CVE-2017-17678 BMC Remedy Mid Tier 9.1SP3 跨站脚本漏洞
CVE-2017-17675 BMC Software BMC Remedy 9.1SP3 日志信息泄露漏洞
CVE-2017-17677 BMC Remedy 9.1SP3 安全漏洞
CVE-2021-27924 Couchbase Server 安全漏洞
CVE-2021-3445 Red Hat libdnf 数据伪造问题漏洞
CVE-2021-31930 concerto 跨站脚本漏洞
CVE-2021-33204 PostgreSQL 命令注入漏洞
CVE-2021-31158 Couchbase Server 安全漏洞
CVE-2021-25644 Couchbase Server 安全漏洞
CVE-2020-36364 Smartstore SmartStoreNET 路径遍历漏洞
CVE-2021-27925 Couchbase Server 竞争条件问题漏洞
CVE-2020-36365 Smartstore SmartStoreNET 输入验证错误漏洞

IV. Related Vulnerabilities

Same product: libxml2
Same vendor: n/a
Same weakness: CWE-787

V. Comments for CVE-2021-3517

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