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CVE-2018-20000

25
FAUCET Score

CVE-2018-20000 is a high-severity XML External Entity (XXE) vulnerability affecting Apereo Bedework bw-webdav versions prior to 4.0.3. This flaw, found in webdav/servlet/common/MethodBase.java and webdav/servlet/common/PostRequestPars.java, allows an unauthenticated attacker to read local files on the server by submitting a specially crafted invite-reply document. With a CVSS v3 score of 7.5, this vulnerability has a low attack complexity and requires no user interaction, posing a significant risk of information disclosure. There is currently no public exploit code available, nor is there evidence of active exploitation or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 4.0.3CPE matchmatch criteria
cpe:2.3:a:apereo:bw-webdav:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.69%
Probability of exploitation in next 30 days
EPSS Percentile
74.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0169 is in the 57th percentile among its peer group of 51,553 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
mavenpatch availablevia ghsa
Product: org.bedework:bw-webdavFixed in: 4.0.3

Vendor Advisories (1)

mavenGHSA-5p52-j8pw-j7x5high

Improper Restriction of XML External Entity Reference in bedework:bw-webdav

Dec 19, 2018

References

github.com / Bedework/bw-webdav/compare/bw-webdav-4.0.2...bw-webdav-4.0.3
PatchThird Party Advisory
github.com / Bedework/bw-webdav/pull/1
PatchThird Party Advisory