CVE-2021-26720
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I. Basic Information for CVE-2021-26720
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Debian avahi 后置链接漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Avahi是一套用于Linux的本地服务发现工具。 Debian avahi 中存在后置链接漏洞，该漏洞并允许本地攻击者通过对/run/avahi-daemon下的文件进行符号链接攻击来造成拒绝服务或创建任意空文件。
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 |
|---|---|---|---|---|
| - | n/a | n/a | - |
II. Public POCs for CVE-2021-26720
| # | POC Description | Source Link | Shenlong Link |
|---|
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- CVE-2021-26720x_refsource_MISC
- https://www.openwall.com/lists/oss-security/2021/02/15/2x_refsource_MISC
- https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824x_refsource_MISC
- https://packages.debian.org/sid/avahi-daemonx_refsource_MISC
- https://packages.debian.org/bullseye/avahi-daemonx_refsource_MISC
- https://bugzilla.suse.com/show_bug.cgi?id=1180827x_refsource_MISC
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-26720
Same Patch Batch · n/a · 2021-02-17 · 87 CVEs total
| CVE-2020-9306 | 8.8 HIGH | Tesla SolarCity Solar Monitoring Gateway 信任管理问题漏洞 |
| CVE-2021-27138 | 7.8 HIGH | Das U-Boot 安全漏洞 |
| CVE-2021-27097 | 7.8 HIGH | Das U-Boot 安全漏洞 |
| CVE-2021-23339 | 5.0 MEDIUM | HTTP Request Smuggling |
| CVE-2020-24480 | Intel XTU 安全漏洞 | |
| CVE-2020-0521 | Intel Graphics Drivers 安全漏洞 | |
| CVE-2020-8678 | Intel Graphics Drivers 安全漏洞 | |
| CVE-2020-0518 | Intel Graphics Drivers 安全漏洞 | |
| CVE-2020-12367 | Intel Graphics Drivers 输入验证错误漏洞 | |
| CVE-2020-12368 | Intel Graphics Drivers 输入验证错误漏洞 | |
| CVE-2020-24462 | Intel Graphics Driver 缓冲区错误漏洞 | |
| CVE-2020-24453 | Intel EPID SDK 输入验证错误漏洞 | |
| CVE-2020-24458 | Intel PROSet Wireless 信息泄露漏洞 | |
| CVE-2020-0544 | Intel Graphics Drivers 安全漏洞 | |
| CVE-2020-24481 | Intel Quartus Prime Pro安全漏洞 | |
| CVE-2020-24482 | Intel 7360 Cell Modem 缓冲区错误漏洞 | |
| CVE-2020-24491 | Intel 10th Generation Intel Core Processor 信息泄露漏洞 | |
| CVE-2020-24500 | Intel Ethernet Controllers 缓冲区错误漏洞 | |
| CVE-2020-24505 | Intel Ethernet Controllers 输入验证错误漏洞 | |
| CVE-2020-24496 | Intel Ethernet Controllers 输入验证错误漏洞 |
Showing top 20 of 87 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same vendor: n/a
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Open5GS SMF ogs_nas_parse_qos_rules denial of service - CVE-2026-8269
Open5GS SMF smf_nsmf_handle_create_sm_context denial of serv - CVE-2026-8268
Open5GS SMF OpenAPI_list_create denial of service
V. Comments for CVE-2021-26720
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