An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend.
An issue has been found in dnsdist before 1.2.0 in the way EDNS0 OPT records are handled when parsing responses from a backend. When dnsdist is configured to add EDNS Client Subnet to a query, the response may contain an EDNS0 OPT record that has to be removed before forwarding the response to the initial client. On a 32-bit system, the pointer arithmetic used when parsing the received response to remove that record might trigger an undefined behavior leading to a crash.
- Published
- Sep 11, 2018
- Updated
- Jun 16, 2026
- EPSS
- 4.6% · 91th percentile
- CWE
- CWE-20
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 30 / 40 · 7.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 4.6%
CNA vs NVD score
- NVD
- 7.5
- CNA · redhat
- 5.9
- 1.6 point gap
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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 | dnsdist | cpe:2.3:a:powerdns:dnsdist |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- powerdns dnsdistup to 1.2.0 inclusive
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.
Open-Xchange dnsdist
- 1.2.0affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | dnsdist | before 1.2.0-1 | 1.2.0-1 |
| openSUSE:Tumbleweed | dnsdist | before 1.8.0~rc1-1.1 | 1.8.0~rc1-1.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP4 | dnsdist | before 1.8.0-150400.9.3.1 | 1.8.0-150400.9.3.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP4 | dnsdist | before 1.8.0-150400.9.3.1 | 1.8.0-150400.9.3.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP4 | luajit | before 2.1.0~beta3+git.1624618403.e9577376-150400.4.2.1 | 2.1.0~beta3+git.1624618403.e9577376-150400.4.2.1 |
| SUSE:Linux Enterprise Module for Basesystem 15 SP4 | luajit | before 2.1.0~beta3+git.1624618403.e9577376-150400.4.2.1 | 2.1.0~beta3+git.1624618403.e9577376-150400.4.2.1 |
| SUSE:Linux Enterprise Server 15 SP1-LTSS | dnsdist | before 1.8.0-150100.3.5.1 | 1.8.0-150100.3.5.1 |
Same product
powerdns: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-33598Out-of-bounds read in cache inspection via Lua37Monitor
- CVE-2017-7557dnsdist version 1.1.0 is vulnerable to a flaw in authentication mechanism for REST API potentially allowing CSRF attack.35Monitor
- CVE-2026-33602Off-by-one access when processing crafted UDP responses32Monitor
- CVE-2026-33599Out-of-bounds read in service discovery32Monitor
- CVE-2026-24028Out-of-bounds read when parsing DNS packets via Lua32Monitor
- CVE-2025-30194Denial of service via crafted DoH exchange31Monitor
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:dnsdist | 1.2.0-1 · Debian:12 | Package registry (OSV) |
| opensuse:dnsdist | 1.8.0-150400.9.3.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| opensuse:luajit | 2.1.0~beta3+git.1624618403.e9577376-150400.4.2.1 · openSUSE:Leap 15.4 | Package registry (OSV) |
| suse:dnsdist | 1.8.0-150400.9.3.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4 | Package registry (OSV) |
| suse:luajit | 2.1.0~beta3+git.1624618403.e9577376-150400.4.2.1 · SUSE:Linux Enterprise Module for Basesystem 15 SP4 | 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-20 · Improper Input ValidationCVSS 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)
- Buffer Overflow via Environment VariablesCAPEC-10likelihood: High · High
- Server Side Include (SSI) InjectionCAPEC-101likelihood: High · High
- Cross Zone ScriptingCAPEC-104likelihood: Medium · High
- Command Line Execution through SQL InjectionCAPEC-108likelihood: Low · Very High
- Object Relational Mapping InjectionCAPEC-109likelihood: Low · High
- SQL Injection through SOAP Parameter TamperingCAPEC-110likelihood: High · Very High
- Double EncodingCAPEC-120likelihood: Low · Medium
- Subverting Environment Variable ValuesCAPEC-13likelihood: High · Very High
ATT&CK techniques
- Obfuscated Files or InformationT1027
- Masquerading: Invalid Code SignatureT1036.001
- Steal Web Session CookieT1539
- Subvert Trust Controls: Code SigningT1553.002
- Impair Defenses:Impair Command History LoggingT1562.003
- Hijack Execution Flow:Dynamic Linker HijackingT1574.006
- Hijack Execution Flow:Path Interception by PATH Environment VariableT1574.007
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- www.securityfocus.com/bid/100509
- bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-7069
- dnsdist.org/security-advisories/powerdns-advisory-for-dnsdist-2017-01.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.