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CVE-2021-43805

25
FAUCET Score

CVE-2021-43805 is a denial-of-service vulnerability affecting Solidus e-commerce platform versions prior to 3.1.4, 3.0.4, and 2.11.13. The flaw stems from an inefficient regular expression used to validate guest order emails, leading to exponential backtracking. With a CVSS score of 7.5 (High), this vulnerability can be exploited remotely with low attack complexity, potentially causing a denial of service without requiring user interaction. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 2.11.13CPE matchmatch criteria
cpe:2.3:a:nebulab:solidus:*:*:*:*:*:*:*:*
>= 3.0.0, < 3.0.4CPE matchmatch criteria
cpe:2.3:a:nebulab:solidus:*:*:*:*:*:*:*:*
>= 3.1.0, < 3.1.4CPE matchmatch criteria
cpe:2.3:a:nebulab:solidus:*:*:*:*:*:*:*:*

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
1.40%
Probability of exploitation in next 30 days
EPSS Percentile
69.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0140 is in the 51st percentile among its peer group of 51,551 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 (4)

github_advisorypatch availablevia nvd_reference
View patch
rubygemspatch availablevia ghsa
Product: solidus_coreFixed in: 2.11.13
rubygemspatch availablevia ghsa
Product: solidus_coreFixed in: 3.0.4
rubygemspatch availablevia ghsa
Product: solidus_coreFixed in: 3.1.4

Vendor Advisories (1)

rubygemsGHSA-qxmr-qxh6-2cc9high

ReDos vulnerability on guest checkout email validation

Dec 7, 2021

References

github.com / solidusio/solidus/commit/9867153e01e3c3b898cdbcedd7b43375ea922401
PatchThird Party Advisory
github.com / solidusio/solidus/security/advisories/GHSA-qxmr-qxh6-2cc9
ExploitMitigationThird Party Advisory