CVE-2018-20677

Exp

In Bootstrap before 3.4.0, XSS is possible in the affix configuration target property.

Published: 2019-01-09 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-20677 is rated High Exploit Risk (65.7/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 4.08%). 1 public exploit reference(s) are indexed (Exploit-DB). 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-2018-20677

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

Exploit prediction scoring system (EPSS) score for CVE-2018-20677

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 9.80% 4.08% -5.72%
2 2026-05-23 10.00% 9.80% -0.19%
3 2026-05-11 — 10.00% —

Full EPSS history (53 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-20677

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.0 MEDIUM
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N 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:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]
4.3 2.0 MEDIUM
AV:N/AC:M/Au:N/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 8.6 2.9 [email protected]

Weakness enumeration for CVE-2018-20677

GitHub Security Advisory for CVE-2018-20677

GHSA-ph58-4vrj-w6hr · Severity: medium · Ecosystem: npm — bootstrap Cross-site Scripting vulnerability

OS Trackers for CVE-2018-20677

vendor priority summary link
debian not yet assigned CVE-2018-20677 not yet assigned priority: Debian including 1 source packages (twitter-bootstrap3), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2018-20677
redhat medium — https://access.redhat.com/security/cve/CVE-2018-20677
ubuntu low CVE-2018-20677 low priority: Ubuntu including 3 source packages (twitter-bootstrap, twitter-bootstrap3, twitter-bootstrap4), 57 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 19, not-affected 14, ignored 13, needs-triage 9, needed 2. https://ubuntu.com/security/CVE-2018-20677

Affected software / configurations for CVE-2018-20677

Vendor Product Version Raw CPE
getbootstrap bootstrap < 3.4.0 cpe:2.3:a:getbootstrap:bootstrap:*:*:*:*:*:*:*:*

References for CVE-2018-20677

URL Tags
https://access.redhat.com/errata/RHBA-2019:1076
https://access.redhat.com/errata/RHBA-2019:1570
https://access.redhat.com/errata/RHSA-2019:1456
https://access.redhat.com/errata/RHSA-2019:3023
https://access.redhat.com/errata/RHSA-2020:0132
https://access.redhat.com/errata/RHSA-2020:0133
https://blog.getbootstrap.com/2018/12/13/bootstrap-3-4-0/ Release Notes Vendor Advisory
https://github.com/twbs/bootstrap/issues/27045 Exploit Issue Tracking Third Party Advisory
https://github.com/twbs/bootstrap/issues/27915#issuecomment-452140906 Issue Tracking Third Party Advisory
https://github.com/twbs/bootstrap/issues/27915#issuecomment-452196628 Issue Tracking Third Party Advisory
https://github.com/twbs/bootstrap/pull/27047 Patch Third Party Advisory
https://lists.apache.org/thread.html/52e0e6b5df827ee7f1e68f7cc3babe61af3b2160f5d74a85469b7b0e%40%3Cdev.superset.apache.org%3E
https://lists.apache.org/thread.html/rd0e44e8ef71eeaaa3cf3d1b8b41eb25894372e2995ec908ce7624d26%40%3Ccommits.pulsar.apache.org%3E
https://www.tenable.com/security/tns-2021-14
cvelogic Threat Intelligence