CVE-2017-15908: canonical ubuntu_linux Loop with Unreachable Exit Condition
Vulnerability summary
CVE-2017-15908 is a high (CVSS 7.5) Loop with Unreachable Exit Condition vulnerability in canonical ubuntu_linux. EPSS estimates a 23.63% chance of exploitation in the next 30 days, higher than 97.8% of scored vulnerabilities.
Severe, CVSS 7.5 (NVD); no exploitation reported by the 5 checked sources; EPSS 24% (FIRST, 04-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 3 · Related 4Timeline
- 26-10-2017PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
6 scores · 4 sources · 3 versions- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · ChainguardEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
23.63%
Chance of exploitation in the next 30 days
Percentile
98%
Versus all other CVEs
30-day change
No change 0.00 pp
From 23.63% on 05-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Chainguard5 products
- py3-systemdAll versions (No fix recorded)
- py3.10-systemdAll versions (No fix recorded)
- py3.11-systemdAll versions (No fix recorded)
- py3.12-systemdAll versions (No fix recorded)
- py3.13-systemdAll versions (No fix recorded)
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04
Debian1 product
- systemd< 235-3
Mageia1 product
- systemd< 230-12.2.mga6
Systemd_project1 product
- systemd223 | 224 | 225 | 226 | 227 | 228 | 229 | 230 | 231 | 232 | 233 | 234 | 235
Ubuntu1 product
- systemd< 229-4ubuntu21.1
6 vendors · 10 products
References
13 links- bugs.launchpad.net/ubuntu/+source/systemd/+bug/1725351X Refsource CONFIRMIssue TrackingPatchThird Party AdvisoryFIX
