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CVE-2021-39229

23
FAUCET Score

CVE-2021-39229 is a Denial of Service (DoS) vulnerability affecting nuxref Apprise, an open-source notification library. Specifically, the IFTTT plugin within Apprise contains an inefficient regular expression that can be exploited to cause a DoS. This vulnerability carries a CVSS score of 7.5 (High), indicating it can be exploited remotely with low attack complexity, requiring no user interaction, and resulting in high availability impact. There is currently no evidence of active exploitation, and no public exploit code (Metasploit, Nuclei, ExploitDB) is available. Community discussion and media coverage for this CVE are minimal.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.9.5.1CPE matchmatch criteria
cpe:2.3:a:nuxref:apprise:*:*:*:*:*:*:*:*

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
1.89%
Probability of exploitation in next 30 days
EPSS Percentile
77.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0189 is in the 61st percentile among its peer group of 51,506 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
pippatch availablevia ghsa
Product: appriseFixed in: 0.9.5.1

Vendor Advisories (1)

pipGHSA-qhmp-h54x-38qrhigh

Apprise vulnerable to regex injection with IFTTT Plugin

Sep 20, 2021

References

github.com / caronc/apprise/blob/0007eade20934ddef0aba38b8f1aad980cfff253/apprise/plugins/NotifyIFTTT.py
ExploitThird Party Advisory
github.com / caronc/apprise/pull/436
PatchThird Party Advisory
github.com / caronc/apprise/security/advisories/GHSA-qhmp-h54x-38qr
Third Party Advisory