High severity · published Mar 28, 2019
CVE-2019-1738
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…
7.5
CVSS
2.5%
EPSS
No
On KEV
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 is due to a parsing issue on DNS packets. An attacker could exploit these vulnerabilities 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)2.5% · higher than 85% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
IX
IOS XE · Cisco
3.2.0ja; 3.16.0as; 3.16.0bs; 3.16.0cs; 3.16.0s; 3.16.1as; +34 more · source: NVD
IO
Ios · Cisco
15.1(2)sg8a; 15.1(3)svg3d; 15.1(3)svi1b; 15.1(3)svk4b; 15.1(3)svk4c; 15.1(3)svm3; +34 more · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2019-1738
CVE.org
https://www.cve.org/CVERecord?id=CVE-2019-1738
Broken Link
http://www.securityfocus.com/bid/107597
Patch
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190327-nbar
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