Is CVE-2021-45098 in the CISA KEV catalog?

No. CVE-2021-45098 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-45098?

CVE-2021-45098 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-45098?

CVE-2021-45098 has an EPSS score of 1.82% (76th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-45098?

Upgrade suricata on debian 11 to 1:6.0.1-3+deb11u1 or later.

CVE & CISA-KEV Catalog

CVE-2021-45098

HIGHEPSS 76th pctl

7.5

CVSS v3

NVD

Description

An issue was discovered in Suricata before 6.0.4. It is possible to bypass/evade any HTTP-based signature by faking an RST TCP packet with random TCP options of the md5header from the client side. After the three-way handshake, it's possible to inject an RST ACK with a random TCP md5header option. Then, the client can send an HTTP GET request with a forbidden URL. The server will ignore the RST ACK and send the response HTTP packet for the client's request. These packets will not trigger a Suricata reject action.

How to fix

Remediation Available

suricataDebian

Fixed in:1:6.0.1-3+deb11u1CVE-2021-45098

Fixed in:1:6.0.4-1CVE-2021-45098

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

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

Exploit Intelligence

1.82%probability of exploitation in 30 days

76thpercentile

Elevated risk: more likely to be exploited than 76% of all known CVEs.

References

Patch2

Vendor Advisory1

forum.suricata.io

Third-Party Advisory1

github.com

Other references1

lists.debian.org

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2025-11-03.