Systemd-resolved: unsigned name response in signed zone is not refused when dnssec=yes
A vulnerability was found in systemd-resolved. This issue may allow systemd-resolved to accept records of DNSSEC-signed domains even when they have no signature, allowing man-in-the-middles (or the upstream DNS resolver) to manipulate records.
- Published
- Dec 23, 2023
- Updated
- Jun 17, 2026
- EPSS
- 0.8% · 56th percentile
- CWE
- CWE-300
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Report tools
Action score
23
Monitor
Low priority for now.
- CVSS
- 23 / 40 · 5.9 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.8%
CNA vs NVD score
- NVD
- 5.9
- CNA · redhat
- 5.9
- 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 |
|---|---|---|
| systemd project | systemd | cpe:2.3:a:systemd_project:systemd |
| debian | debian linux | cpe:2.3:o:debian:debian_linux |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- systemd project systemd25
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.
Red Hat Cryostat 2
- all versionsunknown
Red Hat Red Hat Enterprise Linux 8
- 0:239-82.el8 and laternot affected · rpm
Red Hat Red Hat Enterprise Linux 9
- 0:252-32.el9_4 and laternot affected · rpm
- 0:252-32.el9_4 and laternot affected · rpm
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| AlmaLinux:8 | systemd | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:8 | systemd-container | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:8 | systemd-devel | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:8 | systemd-journal-remote | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:8 | systemd-libs | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:8 | systemd-pam | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:8 | systemd-tests | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:8 | systemd-udev | before 239-82.el8 | 239-82.el8 |
| AlmaLinux:9 | rhel-net-naming-sysattrs | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-boot-unsigned | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-container | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-devel | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-journal-remote | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-libs | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-oomd | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-pam | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-resolved | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-rpm-macros | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| AlmaLinux:9 | systemd-udev | before 252-32.el9_4.alma.1 | 252-32.el9_4.alma.1 |
| Debian:11 | systemd | before 247.3-7+deb11u6 | 247.3-7+deb11u6 |
| Debian:12 | systemd | before 252.21-1~deb12u1 | 252.21-1~deb12u1 |
| Debian:13 | systemd | before 255.1-3 | 255.1-3 |
| openSUSE:Tumbleweed | systemd | before 254.8-4.1 | 254.8-4.1 |
+44
Same product
systemd project: all recordsOther highest-scoring records for the same primary product.
- CVE-2017-9445In systemd through 233, certain sizes passed to dns_packet_new in systemd-resolved can cause it to allocate a buffer that's too small.46Plan
- CVE-2018-21029systemd 239 through 245 accepts any certificate signed by a trusted certificate authority for DNS Over TLS.40Plan
- CVE-2015-7510Stack-based buffer overflow in the getpwnam and getgrnam functions of the NSS module nss-mymachines in systemd.40Plan
- CVE-2017-1000082systemd v233 and earlier fails to safely parse usernames starting with a numeric digit (e.g.40Plan
- CVE-2022-2526A use-after-free vulnerability was found in systemd.39Monitor
- CVE-2017-15908In systemd 223 through 235, a remote DNS server can respond with a custom crafted DNS NSEC resource record to trigger an infinite loop in th37Monitor
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 |
|---|---|---|
| almalinux:rhel-net-naming-sysattrs | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-boot-unsigned | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-container | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-devel | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-journal-remote | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-libs | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-oomd | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-pam | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-resolved | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-rpm-macros | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| almalinux:systemd-udev | 252-32.el9_4.alma.1 · AlmaLinux:9 | Package registry (OSV) |
| debian:systemd | 252.21-1~deb12u1 · Debian:12 | Package registry (OSV) |
| opensuse:systemd | 249.17-150400.8.43.1 · openSUSE:Leap Micro 5.5 | Package registry (OSV) |
| red hat:systemd-boot-unsigned-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-container-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-debugsource | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-devel | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-journal-remote | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-journal-remote-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-libs-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-oomd-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-pam-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-resolved-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| red hat:systemd-standalone-sysusers-debuginfo | 0:252-32.el9_4 · Red Hat:enterprise_linux:9::appstream | Package registry (OSV) |
| rocky linux:systemd | 0:252-32.el9_4 · Rocky Linux:9 | Package registry (OSV) |
| suse:systemd | 249.17-150400.8.43.1 · SUSE:Linux Enterprise Micro 5.3 | 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.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- none
- Integrity
- high · data or configuration can be modified
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- High
- Availability impact
- None
Weakness class (CWE)
CWE-300 · Channel Accessible by Non-EndpointCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
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)
- Leveraging Active Adversary in the Middle Attacks to Bypass Same Origin PolicyCAPEC-466Medium
- Utilizing REST's Trust in the System Resource to Obtain Sensitive DataCAPEC-57likelihood: Medium · Very High
- DNS BlockingCAPEC-589
- IP Address BlockingCAPEC-590likelihood: Low · High
- WiFi MAC Address TrackingCAPEC-612Low
- WiFi SSID TrackingCAPEC-613Low
- Evil Twin Wi-Fi AttackCAPEC-615Low
- Adversary in the Browser (AiTB)CAPEC-662likelihood: High · Very High
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
- access.redhat.com/errata/RHSA-2024:2463
- access.redhat.com/errata/RHSA-2024:3203
- access.redhat.com/security/cve/CVE-2023-7008
- bugzilla.redhat.com/show_bug.cgi?id=2222261
- bugzilla.redhat.com/show_bug.cgi?id=2222672
- github.com/systemd/systemd/issues/25676
- lists.debian.org/debian-lts-announce/2024/09/msg00001.html
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4GMDEG5PKONWNHOEYSUDRT6JEOISRMN2/
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QHNBXGKJWISJETTTDTZKTBFIBJUOSLKL/
- security.netapp.com/advisory/ntap-20241122-0004/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.