CVE-2026-20221

EUVD-2026-107378
Multiple Cisco products are affected by a vulnerability in the generic routing encapsulation (GRE) tunnel decapsulation feature of the Snort 3 Detection Engine that could allow an unauthenticated, remote attacker to cause an unexpected restart of the Snort 3 Detection Engine.

This vulnerability is due to improper handling of nested GRE traffic. An attacker could exploit this vulnerability by sending a crafted GRE payload through an affected device. A successful exploit could allow the attacker to trigger an unexpected reload of the Snort 3 Detection Engine, resulting in either a bypass or denial of service (DoS) condition, depending on device configuration. For more information, see the  section of this advisory. The Snort 3 Detection Engine will restart automatically. No manual intervention is required.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
ciscoCNA
5.8 MEDIUM
NETWORK
LOW
NONE
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:L
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
ciscocyber_vision
3.0.0
CNA
ciscocyber_vision
3.0.2
CNA
ciscocyber_vision
3.0.3
CNA
ciscocyber_vision
3.0.1
CNA
ciscocyber_vision
3.1.0
CNA
ciscocyber_vision
3.0.4
CNA
ciscocyber_vision
3.1.1
CNA
ciscocyber_vision
3.1.2
CNA
ciscocyber_vision
3.2.0
CNA
ciscocyber_vision
3.0.5
CNA
ciscocyber_vision
3.2.1
CNA
ciscocyber_vision
3.0.6
CNA
ciscocyber_vision
3.2.2
CNA
ciscocyber_vision
3.2.3
CNA
ciscocyber_vision
3.2.4
CNA
ciscocyber_vision
4.0.0
CNA
ciscocyber_vision
4.0.1
CNA
ciscocyber_vision
4.0.2
CNA
ciscocyber_vision
4.0.3
CNA
ciscocyber_vision
4.1.0
CNA
ciscocyber_vision
4.1.1
CNA
ciscocyber_vision
4.1.2
CNA
ciscocyber_vision
4.1.3
CNA
ciscocyber_vision
4.1.4
CNA
ciscocyber_vision
4.2.0
CNA
ciscocyber_vision
4.2.1
CNA
ciscocyber_vision
4.1.5
CNA
ciscocyber_vision
4.2.2
CNA
ciscocyber_vision
4.2.0 ≤
𝑥
< 4.3.0
CNA
ciscocyber_vision
4.2.3
CNA
ciscocyber_vision
4.2.4
CNA
ciscocyber_vision
4.2.6
CNA
ciscocyber_vision
4.1.6
CNA
ciscocyber_vision
4.3.0
CNA
ciscocyber_vision
4.3.1
CNA
ciscocyber_vision
4.3.2
CNA
ciscocyber_vision
4.3.3
CNA
ciscocyber_vision
4.4.0
CNA
ciscocyber_vision
4.4.1
CNA
ciscocyber_vision
4.4.2
CNA
ciscocyber_vision
4.4.3
CNA
ciscocyber_vision
4.1.7
CNA
ciscocyber_vision
5.0.0
CNA
ciscocyber_vision
5.0.1
CNA
ciscocyber_vision
5.0.2
CNA
ciscocyber_vision
5.1.0
CNA
ciscocyber_vision
5.1.1
CNA
ciscocyber_vision
5.1.2
CNA
ciscocyber_vision
5.1.3
CNA
ciscocyber_vision
5.2.0
CNA
ciscocyber_vision
5.2.1
CNA
ciscocyber_vision
5.3.0
CNA
ciscocyber_vision
5.3.1
CNA
ciscocyber_vision
5.3.2
CNA
ciscocyber_vision
5.3.3
CNA
ciscocyber_vision
5.5.1
CNA
ciscocyber_vision
5.6.1
CNA
ciscocyber_vision
5.6.0
CNA
ciscocyber_vision
5.4.0
CNA
ciscocyber_vision
5.4.1
CNA
ciscocyber_vision
5.4.2
CNA
ciscocyber_vision
3.12.2.0
CNA
ciscocyber_vision
3.1.2.0
CNA
ciscocyber_vision
3.1.3.0
CNA
ciscocyber_vision
3.1.4.0
CNA
ciscocyber_vision
3.1.5.0
CNA
ciscocyber_vision
3.1.6.0
CNA
ciscocyber_vision
3.1.7.0
CNA
ciscocyber_vision
3.1.8.0
CNA
ciscocyber_vision
3.1.9.0
CNA
ciscocyber_vision
3.1.10.0
CNA
ciscocyber_vision
3.1.12.0
CNA
ciscocyber_vision
3.1.13.0
CNA
ciscocyber_vision
3.1.14.0
CNA
ciscocyber_vision
3.1.15.0
CNA
ciscocyber_vision
3.1.16.0
CNA
ciscocyber_vision
3.1.17.0
CNA
ciscocyber_vision
3.1.18.0
CNA
ciscocyber_vision
3.1.19.0
CNA
ciscocyber_vision
3.1.20.0
CNA
ciscocyber_vision
3.1.21.0
CNA
ciscocyber_vision
3.1.22.0
CNA
ciscocyber_vision
3.1.23.0
CNA
ciscocyber_vision
3.1.24.0
CNA
ciscocyber_vision
3.1.25.0
CNA
ciscocyber_vision
3.1.27.0
CNA
ciscocyber_vision
3.1.28.0
CNA
ciscocyber_vision
3.1.29.0
CNA
ciscocyber_vision
3.1.30.0
CNA
ciscocyber_vision
3.1.31.0
CNA
ciscocyber_vision
3.1.32.0
CNA
ciscocyber_vision
3.1.36.0
CNA
ciscocyber_vision
3.1.38.0
CNA
ciscocyber_vision
3.1.39.0
CNA
ciscocyber_vision
3.1.40.0
CNA
ciscocyber_vision
3.1.41.0
CNA
ciscocyber_vision
3.1.42.0
CNA
ciscocyber_vision
3.1.43.0
CNA
ciscocyber_vision
3.1.45.0
CNA
ciscocyber_vision
3.1.47.0
CNA
ciscocyber_vision
3.1.48.0
CNA
ciscocyber_vision
3.1.50.0
CNA
ciscocyber_vision
3.1.51.0
CNA
ciscocyber_vision
3.1.52.0
CNA
ciscocyber_vision
3.1.53.0
CNA
ciscocyber_vision
3.1.55.0
CNA
ciscocyber_vision
3.1.56.0
CNA
ciscocyber_vision
3.1.57.0
CNA
ciscocyber_vision
3.1.58.0
CNA
ciscocyber_vision
3.1.59.0
CNA
ciscocyber_vision
3.1.60.0
CNA
ciscocyber_vision
3.1.61.0
CNA
ciscocyber_vision
3.1.62.0
CNA
ciscocyber_vision
3.1.63.0
CNA
ciscocyber_vision
3.1.64.0
CNA
ciscocyber_vision
3.1.65.0
CNA
ciscocyber_vision
3.1.66.0
CNA
ciscocyber_vision
3.1.67.0
CNA
ciscocyber_vision
3.1.69.0
CNA
ciscocyber_vision
3.1.70.0
CNA
ciscocyber_vision
3.1.71.0
CNA
ciscocyber_vision
3.1.72.0
CNA
ciscocyber_vision
3.1.73.0
CNA
ciscocyber_vision
3.1.74.0
CNA
ciscocyber_vision
3.1.75.0
CNA
ciscocyber_vision
3.1.76.0
CNA
ciscocyber_vision
3.1.77.0
CNA
ciscocyber_vision
3.1.78.0
CNA
ciscocyber_vision
3.1.81.0
CNA
ciscocyber_vision
3.1.82.0
CNA
ciscocyber_vision
3.1.83.0
CNA
ciscocyber_vision
3.1.84.0
CNA
ciscocyber_vision
3.2.1.0
CNA
ciscocyber_vision
3.2.2.0
CNA
ciscocyber_vision
3.3.0.0
CNA
ciscocyber_vision
3.3.1.0
CNA
ciscocyber_vision
3.3.2.0
CNA
ciscocyber_vision
3.3.3.0
CNA
ciscocyber_vision
3.3.4.0
CNA
ciscocyber_vision
3.3.5.0
CNA
ciscocyber_vision
3.3.7.0
CNA
ciscocyber_vision
3.5.0.0
CNA
ciscocyber_vision
3.5.1.0
CNA
ciscocyber_vision
3.8.1.0
CNA
ciscocyber_vision
3.6.0.0
CNA
ciscocyber_vision
3.6.2.0
CNA
ciscocyber_vision
3.9.3.0
CNA
ciscocyber_vision
3.7.2.0
CNA
ciscocyber_vision
3.7.0.0
CNA
ciscocyber_vision
3.9.6.0
CNA
ciscocyber_vision
3.10.0.0
CNA
ciscocyber_vision
3.10.2.0
CNA
ciscocyber_vision
3.7.4.0
CNA
ciscocyber_vision
3.9.0.0
CNA
ciscocyber_vision
3.5.2.0
CNA
ciscocyber_vision
3.12.1.0
CNA
ciscocyber_vision
3.6.1.0
CNA
ciscocyber_vision
3.9.2.0
CNA
ciscocyber_vision
3.6.3.0
CNA
ciscocyber_vision
3.9.5.0
CNA
ciscocyber_vision
3.7.1.0
CNA
ciscocyber_vision
3.9.7.0
CNA
ciscocyber_vision
3.7.3.0
CNA
ciscocyber_vision
3.10.1.0
CNA
ciscocyber_vision
3.9.1.0
CNA
ciscocyber_vision
3.11.1.0
CNA
ciscocyber_vision
7.0.0
CNA
ciscocyber_vision
7.0.0.1
CNA
ciscocyber_vision
7.0.1
CNA
ciscocyber_vision
7.0.1.1
CNA
ciscocyber_vision
7.0.2
CNA
ciscocyber_vision
7.2.0
CNA
ciscocyber_vision
7.0.2.1
CNA
ciscocyber_vision
7.0.3
CNA
ciscocyber_vision
7.2.0.1
CNA
ciscocyber_vision
7.0.4
CNA
ciscocyber_vision
7.2.1
CNA
ciscocyber_vision
7.0.5
CNA
ciscocyber_vision
7.3.0
CNA
ciscocyber_vision
7.2.2
CNA
ciscocyber_vision
7.2.3
CNA
ciscocyber_vision
7.3.1
CNA
ciscocyber_vision
7.2.4
CNA
ciscocyber_vision
7.0.6
CNA
ciscocyber_vision
7.2.5
CNA
ciscocyber_vision
7.2.4.1
CNA
ciscocyber_vision
7.3.1.1
CNA
ciscocyber_vision
7.4.0
CNA
ciscocyber_vision
7.0.6.1
CNA
ciscocyber_vision
7.2.5.1
CNA
ciscocyber_vision
7.4.1
CNA
ciscocyber_vision
7.2.6
CNA
ciscocyber_vision
7.0.6.2
CNA
ciscocyber_vision
7.4.1.1
CNA
ciscocyber_vision
7.2.7
CNA
ciscocyber_vision
7.2.5.2
CNA
ciscocyber_vision
7.3.1.2
CNA
ciscocyber_vision
7.2.8
CNA
ciscocyber_vision
7.6.0
CNA
ciscocyber_vision
7.4.2
CNA
ciscocyber_vision
7.2.8.1
CNA
ciscocyber_vision
7.0.6.3
CNA
ciscocyber_vision
7.4.2.1
CNA
ciscocyber_vision
7.2.9
CNA
ciscocyber_vision
7.0.7
CNA
ciscocyber_vision
7.7.0
CNA
ciscocyber_vision
7.4.2.2
CNA
ciscocyber_vision
7.2.10
CNA
ciscocyber_vision
7.6.1
CNA
ciscocyber_vision
7.4.2.3
CNA
ciscocyber_vision
7.0.8
CNA
ciscocyber_vision
7.6.2
CNA
ciscocyber_vision
7.7.10
CNA
ciscocyber_vision
7.7.11
CNA
ciscocyber_vision
7.0.8.1
CNA
ciscocyber_vision
7.6.2.1
CNA
ciscocyber_vision
7.7.10.1
CNA
ciscocyber_vision
7.4.2.4
CNA
ciscocyber_vision
7.2.10.2
CNA
ciscocyber_vision
7.4.3
CNA
ciscocyber_vision
7.6.4
CNA
ciscocyber_vision
10.0.0
CNA
ciscocyber_vision
7.4.4
CNA
ciscocyber_vision
7.0.9
CNA
ciscocyber_vision
7.2.11
CNA
ciscocyber_vision
7.4.7
CNA
ciscocyber_vision
2.6.0
CNA
ciscocyber_vision
2.5.6
CNA
ciscocyber_vision
2.5
CNA
ciscocyber_vision
2.4.12
CNA
ciscocyber_vision
2.7
CNA
ciscocyber_vision
2.6.2
CNA
ciscocyber_vision
2.5.5
CNA
ciscocyber_vision
2.5.4
CNA
ciscocyber_vision
2.8
CNA
ciscocyber_vision
2.6.1
CNA
ciscocyber_vision
2.5.7
CNA
ciscocyber_vision
1.5.4
CNA
ciscocyber_vision
1.5.5
CNA
ciscocyber_vision
1.5.6
CNA
ciscocyber_vision
2.0.0
CNA
ciscocyber_vision
2.0.2
CNA
ciscocyber_vision
2.0.3
CNA
ciscocyber_vision
2.1.0
CNA
ciscocyber_vision
2.1.2
CNA
ciscocyber_vision
2.1.4
CNA
ciscocyber_vision
2.1.5
CNA
ciscocyber_vision
2.2
CNA
ciscocyber_vision
2.2.1
CNA
ciscocyber_vision
2.3
CNA
ciscocyber_vision
2.3.1
CNA
ciscocyber_vision
2.4
CNA
ciscocyber_vision
2.4.4
CNA
ciscocyber_vision
2.4.6
CNA
ciscocyber_vision
2.8.9
CNA
ciscocyber_vision
3.0
CNA
ciscocyber_vision
3.1
CNA
ciscocyber_vision
3.2
CNA
ciscocyber_vision
2.8.1
CNA
ciscocyber_vision
2.8.2
CNA
ciscocyber_vision
2.8.3
CNA
ciscocyber_vision
2.8.4
CNA
ciscocyber_vision
2.8.5
CNA
ciscocyber_vision
3.1.3
CNA
ciscocyber_vision
3.1.4
CNA
ciscocyber_vision
3.3
CNA
ciscocyber_vision
3.3.1
CNA
ciscocyber_vision
3.3.2
CNA
ciscocyber_vision
3.3.3
CNA
ciscocyber_vision
3.3.4
CNA
ciscocyber_vision
3.4
CNA
ciscocyber_vision
3.4.1
CNA
ciscocyber_vision
3.4.2
CNA
ciscocyber_vision
3.4.3
CNA
ciscocyber_vision
3.4.4
CNA
ciscocyber_vision
3.4.5
CNA
ciscocyber_vision
3.4.6
CNA
ciscocyber_vision
3.5
CNA
ciscocyber_vision
2.7.1
CNA
ciscocyber_vision
2.7.2
CNA
ciscocyber_vision
2.7.6
CNA
ciscocyber_vision
2.7.9
CNA
ciscocyber_vision
2.7.10
CNA
ciscocyber_vision
3.5.1
CNA
ciscocyber_vision
3.5.2
CNA
ciscocyber_vision
3.6.1
CNA
ciscocyber_vision
3.6.2
CNA
ciscocyber_vision
3.7
CNA
ciscocyber_vision
3.7.1
CNA
ciscocyber_vision
3.8.3
CNA
ciscocyber_vision
3.17.1S:S
CNA
ciscocyber_vision
16.12.3
CNA
ciscocyber_vision
16.12.4
CNA
ciscocyber_vision
17.3.1a:a
CNA
ciscocyber_vision
16.6.6
CNA
ciscocyber_vision
16.12.2
CNA
ciscocyber_vision
3.17.0S:S
CNA
ciscocyber_vision
16.6.5
CNA
ciscocyber_vision
17.2.1r:r
CNA
ciscocyber_vision
17.1.1
CNA
ciscocyber_vision
16.6.7a:a
CNA
ciscocyber_vision
16.6.1
CNA
ciscocyber_vision
16.12.1a:a
CNA
ciscocyber_vision
17.3.2
CNA
ciscocyber_vision
17.4.1a:a
CNA
ciscocyber_vision
16.12.5
CNA
ciscocyber_vision
17.5.1
CNA
ciscocyber_vision
16.6.9
CNA
ciscocyber_vision
17.3.3
CNA
ciscocyber_vision
17.5.1a:a
CNA
ciscocyber_vision
17.3.4
CNA
ciscocyber_vision
17.3.4a:a
CNA
ciscocyber_vision
17.4.2
CNA
ciscocyber_vision
17.4.1b:b
CNA
ciscocyber_vision
17.6.1a:a
CNA
ciscocyber_vision
16.6.10
CNA
ciscocyber_vision
17.7.1a:a
CNA
ciscocyber_vision
16.12.6
CNA
ciscocyber_vision
17.6.2
CNA
ciscocyber_vision
17.8.1a:a
CNA
ciscocyber_vision
16.12.7
CNA
ciscocyber_vision
17.3.5
CNA
ciscocyber_vision
17.6.3
CNA
ciscocyber_vision
17.6.3a:a
CNA
ciscocyber_vision
17.7.2
CNA
ciscocyber_vision
17.9.1a:a
CNA
ciscocyber_vision
17.6.4
CNA
ciscocyber_vision
17.10.1a:a
CNA
ciscocyber_vision
17.3.6
CNA
ciscocyber_vision
16.12.8
CNA
ciscocyber_vision
17.3.7
CNA
ciscocyber_vision
17.9.2a:a
CNA
ciscocyber_vision
17.6.5
CNA
ciscocyber_vision
17.11.1a:a
CNA
ciscocyber_vision
17.9.3a:a
CNA
ciscocyber_vision
17.12.1a:a
CNA
ciscocyber_vision
17.9.4
CNA
ciscocyber_vision
17.6.6
CNA
ciscocyber_vision
17.3.8
CNA
ciscocyber_vision
17.3.8a:a
CNA
ciscocyber_vision
17.6.6a:a
CNA
ciscocyber_vision
17.9.4a:a
CNA
ciscocyber_vision
17.12.2
CNA
ciscocyber_vision
17.13.1a:a
CNA
ciscocyber_vision
17.9.5a:a
CNA
ciscocyber_vision
17.12.3
CNA
ciscocyber_vision
17.6.7
CNA
ciscocyber_vision
17.14.1a:a
CNA
ciscocyber_vision
17.12.4
CNA
ciscocyber_vision
17.12.3a:a
CNA
ciscocyber_vision
17.15.1a:a
CNA
ciscocyber_vision
17.6.8
CNA
ciscocyber_vision
17.9.6
CNA
ciscocyber_vision
17.6.8a:a
CNA
ciscocyber_vision
17.16.1a:a
CNA
ciscocyber_vision
17.9.5e:e
CNA
ciscocyber_vision
17.12.4a:a
CNA
ciscocyber_vision
17.15.2c:c
CNA
ciscocyber_vision
17.9.5f:f
CNA
ciscocyber_vision
17.12.4b:b
CNA
ciscocyber_vision
17.15.2a:a
CNA
ciscocyber_vision
17.12.5
CNA
ciscocyber_vision
17.17.1
CNA
ciscocyber_vision
17.12.5a:a
CNA
ciscocyber_vision
17.9.7a:a
CNA
ciscocyber_vision
17.15.3a:a
CNA
ciscocyber_vision
17.15.3
CNA
ciscocyber_vision
17.12.5b:b
CNA
ciscocyber_vision
17.12.5c:c
CNA
ciscocyber_vision
17.15.4
CNA
ciscocyber_vision
17.9.7b:b
CNA
ciscocyber_vision
17.18.1
CNA
ciscocyber_vision
17.18.1a:a
CNA
ciscocyber_vision
17.12.6
CNA
ciscocyber_vision
17.9.8
CNA
ciscocyber_vision
17.15.4c:c
CNA
ciscocyber_vision
17.12.5d:d
CNA
ciscocyber_vision
17.18.2
CNA
ciscocyber_vision
26.1.1
CNA
ciscocyber_vision
17.15.5
CNA
ciscocyber_vision
17.15.5a:a
CNA
ciscocyber_vision
17.12.7
CNA
ciscocyber_vision
17.12.7a:a
CNA
ciscocyber_vision
17.12.7b:b
CNA
ciscocyber_vision
17.9.9
CNA
ciscocyber_vision
17.18.3a:a
CNA
ciscocyber_vision
17.12.8
CNA
ciscocyber_vision
17.15.6
CNA
ciscocyber_vision
17.18.4
CNA
ciscocyber_vision
26.1.2
CNA
ciscocyber_vision
17.9.10
CNA