CVE-2021-35063Public exploitNetwork attack vector

HTTP detection evasion via crafted SYN acknowledgment

Published Jul 22, 2021 · Updated Aug 4, 2024

TCP stream-tracking evasion in Suricata before 5.0.7 and 6.x before 6.0.3 allows remote attackers to bypass HTTP inspection. The TCP stream engine rejects an entire flow when a crafted initial SYN carries an unexpected ACK value, although Windows and Linux accept the connection. An attacker able to send crafted network traffic can therefore prevent HTTP logging and evade rules that depend on the discarded session.

CVSS severity7.5
High
EPSS probability1.97%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

TCP stream-tracking evasion in Suricata before 5.0.7 and 6.x before 6.0.3 allows remote attackers to bypass HTTP inspection. The TCP stream engine rejects an entire flow when a crafted initial SYN carries an unexpected ACK value, although Windows and Linux accept the connection. An attacker able to send crafted network traffic can therefore prevent HTTP logging and evade rules that depend on the discarded session.

The record

CVE
CVE-2021-35063
Published
Jul 22, 2021
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1562.006
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:P
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

T1562.006Impair Defenses: Indicator Blocking

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo