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CVE-2023-40599

22
FAUCET Score

CVE-2023-40599 is a Regular expression Denial-of-Service (ReDoS) vulnerability affecting Mailform Pro CGI 4.3.1.3 and earlier, specifically within several of its add-ons. A remote, unauthenticated attacker can exploit this flaw to cause a denial-of-service condition. With a CVSS score of 7.5 (HIGH), this vulnerability has a low attack complexity and requires no user interaction, making it easily exploitable to disrupt service availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.3.1.3CPE matchmatch criteria
cpe:2.3:a:synck_graphica:mailform_pro_cgi:*:*:*:*:*:*:*:*

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
0.67%
Probability of exploitation in next 30 days
EPSS Percentile
48.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0067 is in the 24th 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

Remediation records are not available for this CVE.

References

jvn.jp / en/jp/JVN86484824
Third Party Advisory
synck.com / blogs/news/newsroom/detail_1691668841.html
Vendor Advisory