CVE-2019-17026

critical KEV

Published 2021-11-03 · Modified 2021-11-03

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CVSS v3

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CVSS v4 NEW

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not yet in upstream

VIR risk

10.0

Description

Mozilla Firefox and Thunderbird contain a type confusion vulnerability due to incorrect alias information in the IonMonkey JIT compiler when setting array elements.

CISA KEV

Vendor: Mozilla
Product: Firefox and Thunderbird
Due date: 2022-05-03

Predictions

Exploit likelihood

99%

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 with source_tier=community-verified.

Exploits

Public proof-of-concept code below. AS-IS, for defenders and authorised testing only.

Exploit-DB

EDB-49864 local windows_x86-64

Forrest Orr · 2021-05-13

Firefox 72 IonMonkey - JIT Type Confusion

Source code queued for fetch — refresh in a moment.

OS impact

Arch Fixed 1 release

Version	Status	Fixed in
—	Fixed	`68.4.1-1`

Debian Fixed 5 releases

Version	Status	Fixed in
trixie	Fixed	`68.4.1esr-1`
sid	Fixed	`72.0.1-1`
forky	Fixed	`68.4.1esr-1`
bullseye	Fixed	`68.4.1esr-1`
bookworm	Fixed	`68.4.1esr-1`

Red Hat Fixed 1 release

Version	Status	Fixed in
8	Fixed	—

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.