Vulnerability identifier: #VU53609
Vulnerability risk: Medium
CVSSv3.1: 4.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L/E:U/RL:O/RC:C]
CVE-ID:
CWE-ID:
CWE-20
Exploitation vector: Local network
Exploit availability: No
Vulnerable software:
DHCP
Server applications /
Other server solutions
Vendor: ISC
Description
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack or gain access to sensitive information.
The vulnerability exists due to insufficient validation of options data stored in DHCP leases. A remote attacker can pass specially crafted input to the application and perform a denial of service (DoS) attack or gain access to sensitive information.
Both dhcpd and dhclient are affected by the vulnerability.
Mitigation
Install updates from vendor's website.
Vulnerable software versions
DHCP: 4.4.0 - 4.4.2 b1, 4.1-esv - 4.1-ESV-R16 b1, 3.1 - 3.1.3, 3.0 - 3.0.6
External links
http://kb.isc.org/docs/cve-2021-25217
Can this vulnerability be exploited remotely?
Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.