CVE-2020-3408 — Incorrect Regular Expression in Cisco IOS

CWE-185 — Incorrect Regular ExpressionCWE-400 — Uncontrolled Resource Consumption4 documents4 sources
Severity
8.6HIGHNVD
EPSS
1.2%
top 21.43%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Cisco IOSCisco IOSCisco IOS XE
Timeline
PublishedSep 24
Latest updateMay 24

Description

A vulnerability in the Split DNS feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload, resulting in a denial of service (DoS) condition. The vulnerability occurs because the regular expression (regex) engine that is used with the Split DNS feature of affected releases may time out when it processes the DNS name list configuration. An attacker could exploit this vulnerability by trying to resolve an address o…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:HExploitability: 3.9 | Impact: 4.0

Affected Packages3 packages

▶NVDcisco/ios15.8\(3\)m3
▶NVDcisco/ios_xe15.8\(3\)m3
▶CVEListV5cisco/cisco_iosn/a

🔴Vulnerability Details

2
GHSA
GHSA-53cq-v8h5-f4v2: A vulnerability in the Split DNS feature of Cisco IOS Software and Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an a↗2022-05-24
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CVEList
Cisco IOS and IOS XE Software Split DNS Denial of Service Vulnerability↗2020-09-24
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📋Vendor Advisories

1
Cisco
Cisco IOS and IOS XE Software Split DNS Denial of Service Vulnerability↗2020-09-24
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CVE-2020-3408 — Incorrect Regular Expression in Cisco | cvebase