CVE-2017-15908

In systemd 223 through 235, a remote DNS server can respond with a custom crafted DNS NSEC resource record to trigger an infinite loop in the dns_packet_read_type_window() function of the 'systemd-resolved' service and cause a DoS of the affected service.

Published: 2017-10-26 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-15908 is rated High Risk (69.1/100): CVSS High severity, with high exploitation likelihood (EPSS 23.63%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +23.30% over the last day, indicating growing attacker interest. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2017-15908

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.33% 23.63% +23.30%
2 2026-01-06 0.35% 0.33% -0.02%
3 2025-03-30 — 0.35% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-15908

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-15908

OS Trackers for CVE-2017-15908

vendor priority summary link
debian not yet assigned CVE-2017-15908 not yet assigned priority: Debian including 1 source packages (systemd), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-15908
redhat medium — https://access.redhat.com/security/cve/CVE-2017-15908
suse medium CVE-2017-15908 severity moderate: SUSE including 524 source package names (0.9.1:libsystemd0-228-150.29.1, 0.9.1:libudev1-228-150.29.1, …), 748 product×package rows across 69 product lines (Container caasp/v4/default-http-backend, Container caasp/v4/dnsmasq-nanny, … (69 product lines)): Fixed 480, Known Affected 157, Known Not Affected 111. https://www.suse.com/security/cve/CVE-2017-15908/
ubuntu medium CVE-2017-15908 medium priority: Ubuntu including 1 source packages (systemd), 5 status rows across 5 suites (artful, trusty, upstream, xenial, zesty): released 3, needs-triage 1, not-affected 1. https://ubuntu.com/security/CVE-2017-15908

Affected software / configurations for CVE-2017-15908

Vendor Product Version Raw CPE
systemd_project systemd 223 cpe:2.3:a:systemd_project:systemd:223:*:*:*:*:*:*:*
systemd_project systemd 224 cpe:2.3:a:systemd_project:systemd:224:*:*:*:*:*:*:*
systemd_project systemd 225 cpe:2.3:a:systemd_project:systemd:225:*:*:*:*:*:*:*
systemd_project systemd 226 cpe:2.3:a:systemd_project:systemd:226:*:*:*:*:*:*:*
systemd_project systemd 227 cpe:2.3:a:systemd_project:systemd:227:*:*:*:*:*:*:*
systemd_project systemd 228 cpe:2.3:a:systemd_project:systemd:228:*:*:*:*:*:*:*
systemd_project systemd 229 cpe:2.3:a:systemd_project:systemd:229:*:*:*:*:*:*:*
systemd_project systemd 230 cpe:2.3:a:systemd_project:systemd:230:*:*:*:*:*:*:*
systemd_project systemd 231 cpe:2.3:a:systemd_project:systemd:231:*:*:*:*:*:*:*
systemd_project systemd 232 cpe:2.3:a:systemd_project:systemd:232:*:*:*:*:*:*:*
systemd_project systemd 233 cpe:2.3:a:systemd_project:systemd:233:*:*:*:*:*:*:*
systemd_project systemd 234 cpe:2.3:a:systemd_project:systemd:234:*:*:*:*:*:*:*
systemd_project systemd 235 cpe:2.3:a:systemd_project:systemd:235:*:*:*:*:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*

References for CVE-2017-15908

URL Tags
http://www.securityfocus.com/bid/101600 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1039662 Third Party Advisory VDB Entry
https://bugs.launchpad.net/ubuntu/+source/systemd/+bug/1725351 Issue Tracking Patch Third Party Advisory
https://github.com/systemd/systemd/pull/7184 Issue Tracking Patch Third Party Advisory
https://usn.ubuntu.com/3558-1/ Patch Third Party Advisory
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