CVE-2021-4209
Quick assessment
Affected
n/a GnuTLS
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
GnuTLS是一款免费的用于实现SSL、TLS和DTLS协议的安全通信库。 GnuTLS 存在安全漏洞，该漏洞源于MD_UPDATE中的空指针解引用。
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-4209
Vulnerability Information
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Vulnerability Title
N/A
Source: CVE Program / CVE List V5
Vulnerability Description
A NULL pointer dereference flaw was found in GnuTLS. As Nettle's hash update functions internally call memcpy, providing zero-length input may cause undefined behavior. This flaw leads to a denial of service after authentication in rare circumstances.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
GnuTLS 代码问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GnuTLS是一款免费的用于实现SSL、TLS和DTLS协议的安全通信库。 GnuTLS 存在安全漏洞，该漏洞源于MD_UPDATE中的空指针解引用。
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 |
|---|---|---|---|---|
| - | GnuTLS | Fixed in gnutls v3.7.3 | - |
|
II. Public POCs for CVE-2021-4209
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Patches & Fixes for CVE-2021-4209 (2)
-
https://gitlab.com/gnutls/gnutls/-/merge_requests/1503 x_refsource_MISC
Vendor Advisories for CVE-2021-4209 (3)
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https://security.netapp.com/advisory/ntap-20220915-0005/ x_refsource_CONFIRM
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https://access.redhat.com/security/cve/CVE-2021-4209 x_refsource_MISC
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https://bugzilla.redhat.com/show_bug.cgi?id=2044156 x_refsource_MISC
Other References for CVE-2021-4209 (1)
-
https://gitlab.com/gnutls/gnutls/-/issues/1306 x_refsource_MISC
Same Patch Batch · n/a · 2022-08-24 · 40 CVEs total
| CVE-2022-25903 | 7.5 HIGH | Denial of Service (DoS) |
| CVE-2022-24375 | 7.5 HIGH | Denial of Service (DoS) |
| CVE-2021-39815 | Google Android 资源管理错误漏洞 | |
| CVE-2021-0946 | Google Android 缓冲区错误漏洞 | |
| CVE-2022-20122 | Google Android 资源管理错误漏洞 | |
| CVE-2021-4178 | Kubernetes 代码问题漏洞 | |
| CVE-2021-4213 | Linux jss 安全漏洞 | |
| CVE-2021-4218 | Linux kernel 安全漏洞 | |
| CVE-2021-4217 | Info-ZIP UnZip 代码问题漏洞 | |
| CVE-2021-4122 | cryptsetup 数据伪造问题漏洞 | |
| CVE-2021-4125 | Red Hat OpenShift 代码问题漏洞 | |
| CVE-2021-4142 | Red Hat Satellite 授权问题漏洞 | |
| CVE-2021-4155 | Red Hat Enterprise Linux 权限许可和访问控制问题漏洞 | |
| CVE-2021-4158 | QEMU 代码问题漏洞 | |
| CVE-2021-4159 | Linux kernel 安全漏洞 | |
| CVE-2021-4041 | Ansible-Runner 操作系统命令注入漏洞 | |
| CVE-2021-4040 | Red Hat AMQ Broker 缓冲区错误漏洞 | |
| CVE-2022-37181 | 72crm 代码问题漏洞 | |
| CVE-2022-37178 | 72crm SQL注入漏洞 | |
| CVE-2018-14520 | Kirby 跨站脚本漏洞 |
Showing top 20 of 40 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
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V. Comments for CVE-2021-4209
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