CVE-2021-20219
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I. Basic Information for CVE-2021-20219
Vulnerability Information
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Vulnerability Title
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Description
A denial of service vulnerability was found in n_tty_receive_char_special in drivers/tty/n_tty.c of the Linux kernel. In this flaw a local attacker with a normal user privilege could delay the loop (due to a changing ldata->read_head, and a missing sanity check) and cause a threat to the system availability.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
不充分的比较
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞，该漏洞源于drivers/tty/n_tty.c中的n_tty_receive_char_special存在拒绝服务漏洞。攻击者可利用该漏洞延迟循环，并对系统可用性造成威胁。
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 |
|---|---|---|---|---|
| - | kernel | kernel 4.18 | - |
II. Public POCs for CVE-2021-20219
| # | POC Description | Source Link | Shenlong Link |
|---|
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No public POC found.
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- https://bugzilla.redhat.com/show_bug.cgi?id=1923738x_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2021-20219
Same Patch Batch · n/a · 2021-03-23 · 39 CVEs total
| CVE-2021-29068 | 9.9 CRITICAL | Netgear NETGEAR 缓冲区错误漏洞 |
| CVE-2021-29066 | 9.6 CRITICAL | Netgear NETGEAR 授权问题漏洞 |
| CVE-2021-29067 | 9.6 CRITICAL | Netgear NETGEAR 授权问题漏洞 |
| CVE-2021-29065 | 9.6 CRITICAL | Netgear NETGEAR RBR850 授权问题漏洞 |
| CVE-2021-29071 | 9.6 CRITICAL | Netgear NETGEAR 命令注入漏洞 |
| CVE-2021-29076 | 9.6 CRITICAL | Netgear NETGEAR 命令注入漏洞 |
| CVE-2021-29077 | 9.6 CRITICAL | 多款Netgear产品命令注入漏洞 |
| CVE-2021-29078 | 9.6 CRITICAL | 多款Netgear产品命令注入漏洞 |
| CVE-2021-29079 | 9.6 CRITICAL | Netgear NETGEAR 命令注入漏洞 |
| CVE-2021-29082 | 9.6 CRITICAL | 多款Netgear产品信息泄露漏洞 |
| CVE-2021-29075 | 8.4 HIGH | 多款Netgear产品缓冲区错误漏洞 |
| CVE-2021-29074 | 8.4 HIGH | NETGEAR 多款产品缓冲区错误漏洞 |
| CVE-2021-29072 | 8.4 HIGH | Netgear NETGEAR 命令注入漏洞 |
| CVE-2021-29070 | 8.4 HIGH | Netgear NETGEAR 命令注入漏洞 |
| CVE-2021-29081 | 8.4 HIGH | 多款Netgear产品缓冲区错误漏洞 |
| CVE-2021-29080 | 8.1 HIGH | Netgear NETGEAR 授权问题漏洞 |
| CVE-2021-29073 | 7.6 HIGH | Netgear NETGEAR 缓冲区错误漏洞 |
| CVE-2020-28503 | 7.3 HIGH | Prototype Pollution |
| CVE-2021-29069 | 7.3 HIGH | 多款Netgear产品命令注入漏洞 |
| CVE-2021-23362 | 5.3 MEDIUM | Regular Expression Denial of Service (ReDoS) |
Showing top 20 of 39 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: kernel
- CVE-2025-26604
Possibility to retrieve bot token by malicious module develo - CVE-2021-35000
OpenBSD Kernel Multicast Routing Uninitialized Memory Inform - CVE-2021-34999
OpenBSD Kernel Multicast Routing Uninitialized Memory Inform - CVE-2021-34981
Linux Kernel Bluetooth CMTP Module Double Free Privilege Esc - CVE-2024-24898
Information Leakage in kernel
Same vendor: n/a
- CVE-2026-8276
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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
Same weakness: CWE-697
- CVE-2026-35040
fast-jwt: Stateful RegExp (/g or /y) causes non-deterministi - CVE-2026-34574
Parse Server: Session field immutability bypass via falsy-va - CVE-2026-34210
mppx has Stripe charge credential replay via missing idempot - CVE-2026-32322
soroban-sdk: `Fr` scalar field equality comparison bypasses - CVE-2025-20343
Cisco Identity Services Engine Radius Suppression Denial of
V. Comments for CVE-2021-20219
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