Is CVE-2020-25687 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 87%.

What products does CVE-2020-25687 affect?

Tracked products affected include Dnsmasq. Check the version you run to see whether it is affected.

How do I fix CVE-2020-25687?

Apply the vendor fix in your normal patch cycle. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2020-25687

Q: What is CVE-2020-25687?

CVE-2020-25687 is a medium-severity software vulnerability (CWE-122) with a CVSS score of 5.9. A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS re

MEDIUM severity · CVSS 5.9 · CWE-122

5.9CVSS MEDIUM

Summary

A flaw was found in dnsmasq before version 2.83. A heap-based buffer overflow was discovered in dnsmasq when DNSSEC is enabled and before it validates the received DNS entries. This flaw allows a remote attacker, who can create valid DNS replies, to cause an overflow in a heap-allocated memory. This flaw is caused by the lack of length checks in rfc1035.c:extract_name(), which could be abused to make the code execute memcpy() with a negative size in sort_rrset() and cause a crash in dnsmasq, resulting in a denial of service. The highest threat from this vulnerability is to system availability.

Impact & exploitability

Attack vectorNetwork

Attack complexityHigh

Privileges requiredNone

User interactionNone

Confidentiality impactNone

Integrity impactNone

Availability impactHigh

Exploit probability (EPSS)87%

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products we track (1)

Dnsmasq

Recommendation

Apply the vendor fix in your normal patch cycle. Open any affected product above for its exact safe version.

Official patch: https://bugzilla.redhat.com/show_bug.cgi?id=1891568 ↗

CVE-2020-25687

Summary

Impact & exploitability

Affected products we track (1)

Recommendation

Additional information