01 Record

CVE-2021-47245

netfilter: synproxy: Fix out of bounds when parsing TCP options

HighPUBLISHEDCNA: Linux

CNA base score8.2 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

View raw JSON

02 Description

netfilter: synproxy: Fix out of bounds when parsing TCP options

03 Exploitation and scoring

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

0.78% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 53.2% of scored records. A rank, not a probability.

NVD base score

7.1 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

NVD analysis status

Modified. NVD last modified this record on 2026-08-04.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2024-05-21 14:19Z2 YR AGO

Last updated

2026-08-05 08:46Z1 MO AGO

Reserved

2024-04-10

Assigning CNA

Linux

Record state

PUBLISHED

Severity

High (CVSS 8.2)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Weaknesses

CWE-125Out-of-bounds ReadBase

Data version

5.2

Document digest

d4bcf8c00802769f894e93c2c47b823a3349896a1b6c010a86270c775553df17

05 Affected products

VendorProductVersionsPlatforms

LinuxLinux48b1de4c110a7afa4b85862f6c75af817db26fad to < e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8, 48b1de4c110a7afa4b85862f6c75af817db26fad to < 576c1526b4d83c44ad7b673cb841f36cbc6cb6c4, 48b1de4c110a7afa4b85862f6c75af817db26fad to < 674b5f0c6a4fc5d3abce877048290cea6091fcb1, 48b1de4c110a7afa4b85862f6c75af817db26fad to < 7d9a9a1a88a3da574e019b4de756bc73337b3b0b, 48b1de4c110a7afa4b85862f6c75af817db26fad to < 6defc77d48eff74075b80ad5925061b2fc010d98, 48b1de4c110a7afa4b85862f6c75af817db26fad to < 9cdf299ba4e153b5e56187648420de22c6216f02, 48b1de4c110a7afa4b85862f6c75af817db26fad to < f648089337cb8ed40b2bb96e244f72b9d97dc96b, 48b1de4c110a7afa4b85862f6c75af817db26fad to < 5fc177ab759418c9537433e63301096e733fb915, 3.12—

06 References

git.kernel.orghttps://git.kernel.org/stable/c/e1eb98cfeafdd85537e7e3cefe93ca9bfbcc3ea8
git.kernel.orghttps://git.kernel.org/stable/c/576c1526b4d83c44ad7b673cb841f36cbc6cb6c4
git.kernel.orghttps://git.kernel.org/stable/c/674b5f0c6a4fc5d3abce877048290cea6091fcb1
git.kernel.orghttps://git.kernel.org/stable/c/7d9a9a1a88a3da574e019b4de756bc73337b3b0b
git.kernel.orghttps://git.kernel.org/stable/c/6defc77d48eff74075b80ad5925061b2fc010d98
git.kernel.orghttps://git.kernel.org/stable/c/9cdf299ba4e153b5e56187648420de22c6216f02
git.kernel.orghttps://git.kernel.org/stable/c/f648089337cb8ed40b2bb96e244f72b9d97dc96b
git.kernel.orghttps://git.kernel.org/stable/c/5fc177ab759418c9537433e63301096e733fb915

01 Record index

CVE-2021-47245

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2021-47245

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References