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CVE-2023-42457

21
FAUCET Score

CVE-2023-42457 is a denial-of-service vulnerability affecting plone.rest versions 2.x prior to 2.0.1 and 3.x prior to 3.0.1. Repeated use of the "++api++" traverser in a URL can cause the server to become increasingly unresponsive. This vulnerability has a CVSS score of 7.5 (High), indicating a network-based attack with low complexity and high impact on availability. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
2.0.0CPE matchmatch criteria
cpe:2.3:a:plone:rest:2.0.0:*:*:*:*:*:*:*
3.0.0CPE matchmatch criteria
cpe:2.3:a:plone:rest:3.0.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.81%
Probability of exploitation in next 30 days
EPSS Percentile
53.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0081 is in the 29th percentile among its peer group of 51,485 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 (3)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: plone.restFixed in: 2.0.1
pippatch availablevia ghsa
Product: plone.restFixed in: 3.0.1

Vendor Advisories (1)

pipGHSA-h6rp-mprm-xgcqmedium

plone.rest vulnerable to Denial of Service when ++api++ is used many times

Sep 21, 2023

References

github.com / plone/plone.rest/commit/43b4a7e86206e237e1de5ca3817ed071575882f7
Patch
github.com / plone/plone.rest/commit/77846a9842889b24f35e8bedc2e9d461388d3302
Patch
github.com / plone/plone.rest/security/advisories/GHSA-h6rp-mprm-xgcq
Vendor Advisory
openwall.com / lists/oss-security/2023/09/22/2
Mailing ListThird Party Advisory