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 m
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.
- Published
- Dec 3, 2018
- Updated
- Jun 16, 2026
- EPSS
- 58.6% · 99th percentile
- CWE
- CWE-125
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Report tools
Action score
48
Plan
Add it to your regular patch cycle.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 18 / 30 · 58.6%
CNA vs NVD score
- NVD
- 7.5
- CNA · redhat
- 7.5
- agree
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
| Vendor | Product | CPE |
|---|---|---|
| powerdns | recursor | cpe:2.3:a:powerdns:recursor |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- powerdns recursorbefore 4.1.8
Versions reported by the vendor
Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.
[UNKNOWN] pdns-recursor
- 4.1.8affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | pdns-recursor | before 4.1.8-1 | 4.1.8-1 |
| openSUSE:Tumbleweed | pdns-recursor | before 4.5.5-1.3 | 4.5.5-1.3 |
| SUSE:Package Hub 12 SP1 | pdns-recursor | before 4.1.8-13.1 | 4.1.8-13.1 |
| SUSE:Package Hub 15 | pdns-recursor | before 4.1.2-bp150.2.3.1 | 4.1.2-bp150.2.3.1 |
Same product
powerdns: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-15120An issue has been found in the parsing of authoritative answers in PowerDNS Recursor before 4.0.8, leading to a NULL pointer dereference whe46Plan
- CVE-2009-4009Buffer overflow in PowerDNS Recursor before 3.1.7.2 allows remote attackers to cause a denial of service (daemon crash) or possibly execute 45Plan
- CVE-2020-10030An issue has been found in PowerDNS Recursor 4.1.0 up to and including 4.3.0.42Plan
- CVE-2014-8601PowerDNS Recursor before 3.6.2 does not limit delegation chaining, which allows remote attackers to cause a denial of service ("performance 41Plan
- CVE-2019-3807An issue has been found in PowerDNS Recursor versions 4.1.x before 4.1.9 where records in the answer section of responses received from auth39Monitor
- CVE-2009-4010Unspecified vulnerability in PowerDNS Recursor before 3.1.7.2 allows remote attackers to spoof DNS data via crafted zones.33Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:pdns-recursor | 4.1.8-1 · Debian:12 | Package registry (OSV) |
| opensuse:pdns-recursor | 4.5.5-1.3 · openSUSE:Tumbleweed | Package registry (OSV) |
| suse:pdns-recursor | 4.1.8-13.1 · SUSE:Package Hub 12 SP1 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-125 · Out-of-bounds ReadCVSS vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16855
- docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2018-09.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.