CVE-2021-25217
7.4 · HIGHOverview
CVE-2021-25217 is a high-severity vulnerability affecting isc dhcp. It was published on May 26, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
Technical Description
In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd
Remediation
Check the references section for vendor advisories and patches from isc. Update dhcp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| isc | dhcp | 4.4.0 | Affected |
| siemens | ruggedcom_rox_rx1400_firmware | >= 0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx1500_firmware | >= 2.3.0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx1501_firmware | >= 2.3.0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx1510_firmware | >= 2.3.0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx1511_firmware | >= 2.3.0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx1512_firmware | >= 2.3.0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx1524_firmware | >= 0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx1536_firmware | >= 0, < 2.15.0 | Affected |
| siemens | ruggedcom_rox_rx5000_firmware | >= 2.3.0, < 2.15.0 | Affected |
References
Frequently Asked Questions
What is CVE-2021-25217?
CVE-2021-25217 is a high-severity vulnerability affecting isc dhcp. It was published on May 26, 2021 and has a CVSS 3.1 base score of 7.4 (HIGH).
How severe is CVE-2021-25217?
This vulnerability has a CVSS 3.1 base score of 7.4, rated HIGH. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-25217?
Check the references section for vendor advisories and patches from isc. Update dhcp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-25217?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-25217 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
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