CVE-2021-39229: Apprise is an open source library which allows you to send a notification to almost all of the most popular no

Q: How do I fix CVE-2021-39229?

apprise: upgrade to 0.9.5.1. Exact commands for each OS are on this page.

Q: Is CVE-2021-39229 being exploited?

CVE-2021-39229 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-39229 affect?

CVE-2021-39229 affects apprise. Severity is high (CVSS 7.5). Apprise is an open source library which allows you to send a notification to almost all of the most popular notification services available. In affected versions users who use Apprise granting them access to the IFTTT plugin (which just com

Q: How urgent is CVE-2021-39229?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

This week

HIGH 7.5REMOTEUPGRADE

CVE-2021-39229 is a high-severity flaw (CVSS 7.5) affecting apprise. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apprise is an open source library which allows you to send a notification to almost all of the most popular notification services available. In affected versions users who use Apprise granting them access to the IFTTT plugin (which just comes out of the box) are subject to a denial of service attack on an inefficient regular expression. The vulnerable regular expression is [here](https://github.com/caronc/apprise/blob/0007eade20934ddef0aba38b8f1a

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.9% (top 20%)
CISA exploited list	No
Weakness	CWE-400
Published	2021-09-20
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nuxref

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-09-20 22:15 UTCPublished CVE record published
2026-06-17 04:03 UTCUpdated Record last modified

nuxref apprise UPGRADE

Affected: < 0.9.5.1

Fixed in: 0.9.5.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy apprise || rpm -q apprise || apprise --version

2. UPGRADE to 0.9.5.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade apprise

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade apprise

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-39229?

apprise: upgrade to 0.9.5.1. Exact commands for each OS are on this page.

Is CVE-2021-39229 being exploited?

CVE-2021-39229 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-39229 affect?

CVE-2021-39229 affects apprise. Severity is high (CVSS 7.5). Apprise is an open source library which allows you to send a notification to almost all of the most popular notification services available. In affected versions users who use Apprise granting them access to the IFTTT plugin (which just com

How urgent is CVE-2021-39229?

Priority 56/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

GitHub vulnerabilities

References

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