CVE-2018-16855
An issue has been found in PowerDNS Recursor before version 4.1.8 where a remote attacker sending a DNS query can trigger an out-of-bounds memory read while computing the hash of the query for a packet cache lookup, possibly leading to a crash.
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 58.6%, higher than 99% of all known CVEs. Patch or mitigate before the next change window.
Description
An issue has been found in PowerDNS Recursor before version 4.1.8 where a remote attacker sending a DNS query can trigger an out-of-bounds memory read while computing the hash of the query for a packet cache lookup, possibly leading to a crash.
- CVSS 3.0
- 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 58.58% probability · 99th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-125
- Affected
- powerdns/recursor
- Source
- secalert@redhat.com
EPSS 58.6% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16855Issue Tracking, Third Party Advisory
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-09.htmlVendor Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16855Issue Tracking, Third Party Advisory
- https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-09.htmlVendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.