HIGH
Cisco IOS and IOS XE Software Network-Based Application Recognition Denial of Service Vulnerabilities
Published Mar 27, 2019
8.6
HIGHCVSS 3.1
EPSS 2.19%
Description
A vulnerability in the Network-Based Application Recognition (NBAR) feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability are due to a parsing issue on DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through routers that are running an affected version and have NBAR enabled. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition.
Affected products
-
- Version 16.2.1StatusaffectedConstraints-
- Version 16.2.2StatusaffectedConstraints-
- Version 16.3.1StatusaffectedConstraints-
- Version 16.3.1aStatusaffectedConstraints-
- Version 16.3.2StatusaffectedConstraints-
- Version 16.3.3StatusaffectedConstraints-
- Version 16.3.4StatusaffectedConstraints-
- Version 16.4.1StatusaffectedConstraints-
- Version 16.4.2StatusaffectedConstraints-
- Version 16.4.3StatusaffectedConstraints-
- Version 16.5.1StatusaffectedConstraints-
- Version 16.5.1aStatusaffectedConstraints-
- Version 16.5.1bStatusaffectedConstraints-
- Version 3.16.0SStatusaffectedConstraints-
- Version 3.16.0aSStatusaffectedConstraints-
- Version 3.16.0bSStatusaffectedConstraints-
- Version 3.16.0cSStatusaffectedConstraints-
- Version 3.16.1SStatusaffectedConstraints-
- Version 3.16.1aSStatusaffectedConstraints-
- Version 3.16.2SStatusaffectedConstraints-
- Version 3.16.2aSStatusaffectedConstraints-
- Version 3.16.2bSStatusaffectedConstraints-
- Version 3.16.3SStatusaffectedConstraints-
- Version 3.16.3aSStatusaffectedConstraints-
- Version 3.16.4SStatusaffectedConstraints-
- Version 3.16.4aSStatusaffectedConstraints-
- Version 3.16.4bSStatusaffectedConstraints-
- Version 3.16.4cSStatusaffectedConstraints-
- Version 3.16.4dSStatusaffectedConstraints-
- Version 3.16.4eSStatusaffectedConstraints-
- Version 3.16.4gSStatusaffectedConstraints-
- Version 3.16.5SStatusaffectedConstraints-
- Version 3.16.5aSStatusaffectedConstraints-
- Version 3.17.0SStatusaffectedConstraints-
- Version 3.17.1SStatusaffectedConstraints-
- Version 3.17.1aSStatusaffectedConstraints-
- Version 3.17.2SStatusaffectedConstraints-
- Version 3.17.3SStatusaffectedConstraints-
- Version 3.17.4SStatusaffectedConstraints-
- Version 3.18.0SStatusaffectedConstraints-
- Version 3.18.0SPStatusaffectedConstraints-
- Version 3.18.0aSStatusaffectedConstraints-
- Version 3.18.1SStatusaffectedConstraints-
- Version 3.18.1SPStatusaffectedConstraints-
- Version 3.18.1aSPStatusaffectedConstraints-
- Version 3.18.1bSPStatusaffectedConstraints-
- Version 3.18.1cSPStatusaffectedConstraints-
- Version 3.18.1gSPStatusaffectedConstraints-
- Version 3.18.1hSPStatusaffectedConstraints-
- Version 3.18.1iSPStatusaffectedConstraints-
- Version 3.18.2SStatusaffectedConstraints-
- Version 3.18.2SPStatusaffectedConstraints-
- Version 3.18.2aSPStatusaffectedConstraints-
- Version 3.18.3SStatusaffectedConstraints-
- Version 3.18.4SStatusaffectedConstraints-
- Version 3.2.0JAStatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Cisco | Cisco IOS and Cisco IOS-XE Software | n/a |
|
Configuration 1
OR
- 3.2.0ja
- 3.16.0as
- 3.16.0bs
- 3.16.0cs
- 3.16.0s
- 3.16.1as
- 3.16.1s
- 3.16.2as
- 3.16.2bs
- 3.16.2s
- 3.16.3as
- 3.16.3s
- 3.16.4as
- 3.16.4bs
- 3.16.4cs
- 3.16.4ds
- 3.16.4es
- 3.16.4gs
- 3.16.4s
- 3.16.5as
- 3.16.5s
- 3.17.0s
- 3.17.1as
- 3.17.1s
- 3.17.2s
- 3.17.3s
- 3.17.4s
- 3.18.0as
- 3.18.0s
- 3.18.0sp
- 3.18.1asp
- 3.18.1bsp
- 3.18.1csp
- 3.18.1gsp
- 3.18.1hsp
- 3.18.1isp
- 3.18.1s
- 3.18.1sp
- 3.18.2asp
- 3.18.2s
- 3.18.2sp
- 3.18.3s
- 3.18.4s
- 16.2.1
- 16.2.2
- 16.3.1
- 16.3.1a
- 16.3.2
- 16.3.3
- 16.3.4
- 16.4.1
- 16.4.2
- 16.4.3
- 16.5.1
- 16.5.1a
- 16.5.1b
- 16.9.3s
- 16.9.4c
Configuration 2
OR
- 15.3\(3\)jd
- 15.3\(3\)jd2
- 15.3\(3\)jd3
- 15.3\(3\)jd4
- 15.3\(3\)jd5
- 15.3\(3\)jd6
- 15.3\(3\)jd7
- 15.3\(3\)jd8
- 15.3\(3\)jd9
- 15.3\(3\)jd11
- 15.3\(3\)jd12
- 15.3\(3\)jd13
- 15.3\(3\)jd14
- 15.3\(3\)je
- 15.3\(3\)jf
- 15.3\(3\)jf1
- 15.3\(3\)jf2
- 15.3\(3\)jf4
- 15.3\(3\)jf5
- 15.3\(3\)jg
- 15.3\(3\)jg1
- 15.3\(3\)jh
- 15.3\(3\)jk6
- 15.3\(3\)jnp
- 15.3\(3\)jnp1
- 15.3\(3\)jnp3
- 15.3\(3\)jpb
- 15.3\(3\)jpb1
- 15.3\(3\)jpc
- 15.3\(3\)jpc1
- 15.3\(3\)jpc2
- 15.3\(3\)jpc3
- 15.3\(3\)jpc5
- 15.3\(3\)jpd
- 15.5\(3\)m
- 15.5\(3\)m0a
- 15.5\(3\)m1
- 15.5\(3\)m2
- 15.5\(3\)m2a
- 15.5\(3\)m3
- 15.5\(3\)m4
- 15.5\(3\)m4a
- 15.5\(3\)m4b
- 15.5\(3\)m4c
- 15.5\(3\)m5
- 15.5\(3\)s
- 15.5\(3\)s0a
- 15.5\(3\)s1
- 15.5\(3\)s1a
- 15.5\(3\)s2
- 15.5\(3\)s3
- 15.5\(3\)s4
- 15.5\(3\)s5
- 15.5\(3\)sn
- 15.5\(3\)sn0a
- 15.6\(1\)s
- 15.6\(1\)s1
- 15.6\(1\)s2
- 15.6\(1\)s3
- 15.6\(1\)s4
- 15.6\(1\)sn
- 15.6\(1\)sn1
- 15.6\(1\)sn2
- 15.6\(1\)sn3
- 15.6\(1\)t
- 15.6\(1\)t0a
- 15.6\(1\)t1
- 15.6\(1\)t2
- 15.6\(2\)s
- 15.6\(2\)s1
- 15.6\(2\)s2
- 15.6\(2\)s3
- 15.6\(2\)s4
- 15.6\(2\)sn
- 15.6\(2\)t
- 15.6\(2\)t0a
- 15.6\(2\)t1
- 15.6\(2\)t2
- 15.6\(3\)m
- 15.6\(3\)m0a
- 15.6\(3\)m1
- 15.6\(3\)m1a
- 15.6\(3\)m1b
- 15.6\(3\)sn
- 15.6\(4\)sn
- 15.6\(5\)sn
- 15.6\(6\)sn
- 15.6\(7\)sn
- 15.6\(7\)sn1
- 15.6\(7\)sn2
- 15.6\(7\)sn3
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
8.6 HIGH NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact None
Integrity Impact None
Availability Impact High
8.6 HIGH CVE.org
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Changed
Confidentiality Impact None
Integrity Impact None
Availability Impact High
7.8 HIGH NVD
AV:N/AC:L/Au:N/C:N/I:N/A:C
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Complete
This CVE is not in the KEV list.
CISA SSVC (Vulnrichment)
Stakeholder-Specific Vulnerability Categorization from CISA ADP.
Exploitation
NoneAutomatable
YesTechnical Impact
PartialDecision
n/aAssessed Nov 19, 2024 · SSVC 2.0.3
2.19% 0.02186
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.02186
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (15 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 2.19% (0.02186) | 81.74th | v5 (v2026.06.15) |
| Jun 15, 2026 | 2.19% (0.02186) | 79.99th | v5 (v2026.06.15) |
| Apr 13, 2025 | 0.78% (0.00776) | 71.46th | v4 (v2025.03.14) |
| Mar 17, 2025 | 2.14% (0.02142) | 83.04th | v4 (v2025.03.14) |
| Jul 20, 2024 | 0.16% (0.00157) | 52.55th | v3 (v2023.03.01) |
| Jun 26, 2024 | 0.16% (0.00157) | 52.35th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.16% (0.00157) | 50.35th | v3 (v2023.03.01) |
| Mar 6, 2023 | 1.05% (0.01055) | 52.13th | v2 (v2022.01.01) |
| Sep 17, 2022 | 1.05% (0.01055) | 50.47th | v2 (v2022.01.01) |
| Apr 1, 2022 | 1.05% (0.01055) | 48.43th | v2 (v2022.01.01) |
| Feb 4, 2022 | 4.50% (0.04499) | 74.08th | v2 (v2022.01.01) |
| Feb 3, 2022 | 4.24% (0.04237) | 74.61th | v1 |
| Jan 6, 2022 | 4.24% (0.04237) | 74.40th | v1 |
| Sep 1, 2021 | 0.98% (0.00976) | 61.78th | v1 |
| Apr 14, 2021 | 0.98% (0.00976) | 0.00th | v1 |
Weaknesses (1)
References (2)
- http://www.securityfocus.com/bid/107597 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-nbar vendor-advisoryx_refsource_CISCOPatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/107597 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-nbar | vendor-advisoryx_refsource_CISCOPatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner cisco
Published Mar 27, 2019
Updated Nov 19, 2024
Reserved Dec 6, 2018
Link CVE-2019-1740
CISA Vulnrichment
Updated Nov 19, 2024