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CVE-2026-20066

Uncontrolled resource consumption in Cisco Snort

CVSS score

5.8

EPSS probability

%0.5

Risk score

0.0

Published

7 mo ago

OverviewPublic Exploits (0)NewsroomVulnerability Timeline
Patch status has not yet been verified

Resmî kaynaklarda yeterli kanıt bulunamadı. Bu sonuç “yama yok” anlamına gelmez.

Impact on My Inventory

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Vulnerability description

DayBreach CVE AI Research

CVE-2026-20066 has vendor, distribution, patch and security-source records on file. We can compare them and prepare an explanation linked to the evidence.

Multiple Cisco products are affected by a vulnerability in the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause the Snort 3 Detection Engine to restart, resulting in an interruption of packet inspection. This vulnerability is due to an error in the JSTokenizer normalization logic when the HTTP inspection normalizes JavaScript. An attacker could exploit this vulnerability by sending crafted HTTP packets through an established connection that is parsed by Snort 3. A successful exploit could allow the attacker to cause a DoS condition when the Snort 3 Detection Engine restarts unexpectedly. JSTokenizer is not enabled by default.

IMPACT: Affected Products and Software

Affected Products

The following products are affected by CVE-2026-20066 vulnerability. Where our threat engine knows the exact affected versions, they are listed below.

IDVENDORPRODUCTACTION
1ciscosnort View
2ciscosecure firewall threat defense View
3ciscosecure firewall threat defense View
4ciscosecure firewall threat defense View
5ciscosecure firewall threat defense View
6ciscosecure firewall threat defense View
7ciscosecure firewall threat defense View
8ciscosecure firewall threat defense View
9ciscosecure firewall threat defense View
10ciscosecure firewall threat defense View
11ciscosecure firewall threat defense View
12ciscosecure firewall threat defense View
13ciscosecure firewall threat defense View
14ciscosecure firewall threat defense View
15ciscosecure firewall threat defense View
16ciscosecure firewall threat defense View
17ciscosecure firewall threat defense View
18ciscounified threat defense snort intrusion prevention system engine View
19ciscounified threat defense snort intrusion prevention system engine View
20ciscounified threat defense snort intrusion prevention system engine View
21ciscounified threat defense snort intrusion prevention system engine View
22ciscounified threat defense snort intrusion prevention system engine View
23ciscounified threat defense snort intrusion prevention system engine View
24ciscounified threat defense snort intrusion prevention system engine View
25ciscounified threat defense snort intrusion prevention system engine View
26ciscounified threat defense snort intrusion prevention system engine View
27ciscounified threat defense snort intrusion prevention system engine View
28ciscounified threat defense snort intrusion prevention system engine View
29ciscounified threat defense snort intrusion prevention system engine View
30ciscounified threat defense snort intrusion prevention system engine View
31ciscounified threat defense snort intrusion prevention system engine View
32ciscounified threat defense snort intrusion prevention system engine View
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34ciscounified threat defense snort intrusion prevention system engine View
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36ciscounified threat defense snort intrusion prevention system engine View
37ciscounified threat defense snort intrusion prevention system engine View
38ciscounified threat defense snort intrusion prevention system engine View
39ciscounified threat defense snort intrusion prevention system engine View
40ciscounified threat defense snort intrusion prevention system engine View
41ciscounified threat defense snort intrusion prevention system engine View
42ciscounified threat defense snort intrusion prevention system engine View
43ciscounified threat defense snort intrusion prevention system engine View
44ciscounified threat defense snort intrusion prevention system engine View
45ciscounified threat defense snort intrusion prevention system engine View
46ciscounified threat defense snort intrusion prevention system engine View
47ciscounified threat defense snort intrusion prevention system engine View
48ciscounified threat defense snort intrusion prevention system engine View
49ciscounified threat defense snort intrusion prevention system engine View
50ciscounified threat defense snort intrusion prevention system engine View
51ciscounified threat defense snort intrusion prevention system engine View
52ciscounified threat defense snort intrusion prevention system engine View
53ciscounified threat defense snort intrusion prevention system engine View
54ciscounified threat defense snort intrusion prevention system engine View
55ciscounified threat defense snort intrusion prevention system engine View
56ciscounified threat defense snort intrusion prevention system engine View
57ciscounified threat defense snort intrusion prevention system engine View
58ciscounified threat defense snort intrusion prevention system engine View
59ciscounified threat defense snort intrusion prevention system engine View
60ciscounified threat defense snort intrusion prevention system engine View
61ciscounified threat defense snort intrusion prevention system engine View
62ciscounified threat defense snort intrusion prevention system engine View
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71ciscounified threat defense snort intrusion prevention system engine View
72ciscounified threat defense snort intrusion prevention system engine View
73ciscounified threat defense snort intrusion prevention system engine View
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75ciscounified threat defense snort intrusion prevention system engine View
76ciscounified threat defense snort intrusion prevention system engine View
77ciscounified threat defense snort intrusion prevention system engine View
78ciscounified threat defense snort intrusion prevention system engine View
79ciscounified threat defense snort intrusion prevention system engine View
80ciscounified threat defense snort intrusion prevention system engine View
81ciscounified threat defense snort intrusion prevention system engine View
82ciscounified threat defense snort intrusion prevention system engine View
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85ciscounified threat defense snort intrusion prevention system engine View
86ciscounified threat defense snort intrusion prevention system engine View
87ciscounified threat defense snort intrusion prevention system engine View
88ciscounified threat defense snort intrusion prevention system engine View
Total affected vendors: 1|Products: 88

RED HAT CSAF/VEX: Product Impact Check

Red Hat has not yet published a CSAF/VEX impact record for this CVE. This does not mean “not affected”.

SCORING: CVSS from Multiple Sources

CVSS Scores

The Common Vulnerability Scoring System is a standardised framework for assessing the severity of vulnerabilities in software and systems. We collect and display CVSS scores from several sources for each CVE.

SCOREVERSIONSEVERITYVECTORSOURCE
5.8CVSS V31MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:LNVD

Patch and Remediation Guide

Solution & Remediation Advisory

Patch status unknown

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Confirm the affected product and version against the source evidence above.
Restrict access to internet-facing services and apply network segmentation.
Until a patch is confirmed, follow the vendor advisory; do not read an unknown status as “no patch”.
Monitor server logs and network endpoints for signs of anomalous execution.

Public exploit and active exploitation status

Verified exploit intelligence

No verified public PoC, exploit repository or Metasploit module has been found for this CVE yet.

Weakness Classification and Attack Patterns (CWE & CAPEC)

CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorises the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-20066 is associated with the following CWEs:

CWE-400: Common Weakness Enumeration Entry CWE-400

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-20066 weaknesses.

CAPEC-66: SQL InjectionCAPEC-126: Path TraversalCAPEC-28: OS Command Injection

Attack Vector and Accessibility

ExposureAğ üzerinden
PermissionsGerekmiyor
UserGerekmiyor

Official Sources and Advisories

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snort3-multi-dos-XFWkWSwzvendor-advisory

CVSS Vector Radar Chart

5.8 / 10
Attack VectorNetworkComplexityLowPrivilegesNoneUser Interact.NoneConfidentialityLowIntegrityNoneAvailabilityLow

Vulnerability Scoring Details

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone required
User InteractionNone required
Confidentiality (Gizlilik)Low
Integrity (Bütünlük)None
Availability (Erişilebilirlik)Low

Yama durumu bilinmiyor

İncelenen resmî kaynaklarda yama durumu doğrulanamadı. Bu sonuç “yama yok” anlamına gelmez.

Follow the vendor

C
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cisco

Weakness Type (CWE & CAPEC)

CWE-400

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