CVE-2021-47245

Advisory lineage Upstream: 0 Downstream: 9
Analyzed
Published: 21 May 2024, 14:19
Last modified:11 May 2026, 13:50

Vulnerability Summary

Overall Risk (default)
medium
28/100
CVSS Score
7.1 HIGH
v3.1 (nvd)
EPSS Score
<0.01% LOW
0% probability 0.00%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

21 May 2024, 14:19
Published
Vulnerability first disclosed
11 May 2026, 13:50
Last Modified
Vulnerability information updated

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: Fix out of bounds when parsing TCP options The TCP option parser in synproxy (synproxy_parse_options) could read one byte out of bounds. When the length is 1, the execution flow gets into the loop, reads one byte of the opcode, and if the opcode is neither TCPOPT_EOL nor TCPOPT_NOP, it reads one more byte, which exceeds the length of 1. This fix is inspired by commit 9609dad263f8 ("ipv4: tcp_input: fix stack out of bounds when parsing TCP options."). v2 changes: Added an early return when length < 0 to avoid calling skb_header_pointer with negative length.

CVSS Metrics

  • v3.1•HIGH•Score: 7.1CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

EPSS Trends

Current EPSS score: 0.01%• Percentile: 1%

Techniques & Countermeasures

  • CWE-125•Out-of-bounds Read

    The product reads data past the end, or before the beginning, of the intended buffer.

Affected Systems

  • linux•linux

    ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8 | ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < 576c1526b4d83c44ad7b673cb841f36cbc6cb6c4 | ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < 674b5f0c6a4fc5d3abce877048290cea6091fcb1 | ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < 7d9a9a1a88a3da574e019b4de756bc73337b3b0b | ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < 6defc77d48eff74075b80ad5925061b2fc010d98 | ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < 9cdf299ba4e153b5e56187648420de22c6216f02 | ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < f648089337cb8ed40b2bb96e244f72b9d97dc96b | ≥ 48b1de4c110a7afa4b85862f6c75af817db26fad, < 5fc177ab759418c9537433e63301096e733fb915 | 3.12

  • linux•linux_kernel

    ≥ 3.12, < 4.4.274 | ≥ 4.5, < 4.9.274 | ≥ 4.10, < 4.14.238 | ≥ 4.15, < 4.19.196 | ≥ 4.20, < 5.4.128 | ≥ 5.5, < 5.10.46 | ≥ 5.11, < 5.12.13 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3 | 5.13:rc4 | 5.13:rc5 | 5.13:rc6

References (8)