What’s Vulnerable › Vulnerabilities

CVE-2024-1975: SIG(0) can be used to exhaust CPU resources

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-07-23 · updated 2026-06-17
• Weakness: CWE-770

Description

If a server hosts a zone containing a "KEY" Resource Record, or a resolver DNSSEC-validates a "KEY" Resource Record from a DNSSEC-signed domain in cache, a client can exhaust resolver CPU resources by sending a stream of SIG(0) signed requests. This issue affects BIND 9 versions 9.0.0 through 9.11.37, 9.16.0 through 9.16.50, 9.18.0 through 9.18.27, 9.19.0 through 9.19.24, 9.9.3-S1 through 9.11.37-S1, 9.16.8-S1 through 9.16.49-S1, and 9.18.11-S1 through 9.18.27-S1.

Affected products

• ISC BIND: from 9.0 through 9.11.37; from 9.16.0 through 9.16.50; from 9.16.8 through 9.16.49-s1; from 9.18.0 through 9.18.27; from 9.18.11 through 9.18.27-s1; from 9.19.0 through 9.19.24

References

• http://www.openwall.com/lists/oss-security/2024/07/23/1
• http://www.openwall.com/lists/oss-security/2024/07/31/2
• https://kb.isc.org/docs/cve-2024-1975
• http://www.openwall.com/lists/oss-security/2024/07/23/1
• https://kb.isc.org/docs/cve-2024-1975
• https://security.netapp.com/advisory/ntap-20240731-0002/

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