CVE-2021-3603
unknown
CVSS v3
—
CVSS v4 NEW
—
VIR risk
—
Description
PHPMailer untrusted code may be run from an overridden address validator
Predictions
Exploit likelihood
30%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
Debian Mixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 6.6.3-1 |
| sid | Fixed | 6.6.3-1 |
| forky | Fixed | 6.6.3-1 |
| bullseye | Affected | — |
| bookworm | Fixed | 6.6.3-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Packagist | phpmailer/phpmailer | <6.5.0 | 6.5.0 |
References
- https://security-tracker.debian.org/tracker/CVE-2021-3603
- https://github.com/PHPMailer/PHPMailer/security/advisories/GHSA-77mr-wc79-m8j3
- https://nvd.nist.gov/vuln/detail/CVE-2021-3603
- https://github.com/PHPMailer/PHPMailer/commit/45f3c18dc6a2de1cb1bf49b9b249a9ee36a5f7f3
- https://github.com/FriendsOfPHP/security-advisories/blob/master/phpmailer/phpmailer/CVE-2021-3603.yaml
- https://github.com/PHPMailer/PHPMailer
- https://github.com/PHPMailer/PHPMailer/releases/tag/v6.5.0
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/3YRMWGA4VTMXFB22KICMB7YMFZNFV3EJ
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/FJYSOFCUBS67J3TKR74SD3C454N7VTYM
- https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2021-3603
- https://www.huntr.dev/bounties/1-PHPMailer/PHPMailer
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.