CVE-2017-18361

Exp

In Pylons Colander through 1.6, the URL validator allows an attacker to potentially cause an infinite loop thereby causing a denial of service via an unclosed parenthesis.

Published: 2019-02-01 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-18361 is rated High Exploit Risk (72.9/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.76%). 1 public exploit reference(s) are indexed (Exploit-DB). EPSS rose +1.64% over the last day, indicating growing attacker interest. Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

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

Public exploit references (Exploit-DB) for CVE-2017-18361

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-18361

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 0.13% 1.76% +1.64%
2 2026-02-01 0.40% 0.13% -0.28%
3 2025-12-20 — 0.40% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-18361

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/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-2017-18361

GitHub Security Advisory for CVE-2017-18361

GHSA-rv95-4wxj-6fqq · Severity: high · Ecosystem: pip — Pylons Colander Denial of Service vulnerability

OS Trackers for CVE-2017-18361

vendor priority summary link
ubuntu medium CVE-2017-18361 medium priority: Ubuntu including 1 source packages (python-colander), 17 status rows across 17 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 15, needed 1, needs-triage 1. https://ubuntu.com/security/CVE-2017-18361

Affected software / configurations for CVE-2017-18361

Vendor Product Version Raw CPE
pylonsproject colander <= 1.6 cpe:2.3:a:pylonsproject:colander:*:*:*:*:*:*:*:*

References for CVE-2017-18361

URL Tags
https://github.com/Pylons/colander/issues/290 Exploit Issue Tracking Third Party Advisory
https://github.com/Pylons/colander/pull/323 Patch Third Party Advisory
cvelogic Threat Intelligence