CVE-2019-9810Firefox Memory Corruption
Incorrect alias information in IonMonkey JIT compiler for Array.prototype.slice method may lead to missing bounds check and a buffer overflow.
Published Apr 26, 2019 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2019-9810, DLA-1727-1, DSA-4417-1, MFSA 2019-09, MFSA 2019-10, MFSA 2019-12, UBUNTU-CVE-2019-9810, USN-3919-1
Key Facts
Patch immediately- CVE-2019-9810 is a high-severity vulnerability (CVSS 8.8 v3.1) affecting Firefox (Mozilla), Thunderbird (Mozilla), Enterprise Linux (Redhat) and 20 more products.
- It is exploited in the wild, listed in Industry KEV feed since Nov 8, 2022. A public exploit is reported by tracking sources, but no code link is listed yet.
- EPSS estimates a 30% probability of exploitation in the next 30 days.
- Fixed versions are available, including Firefox 0:60.6.1-1.el6_10, Firefox 0:60.6.1-1.el7_6, Firefox 0:60.6.1-1.el8.
- Brandefense priority: patch immediately, because it is listed as exploited in the wild.
Scores
CVSS v3.1
8.8
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
30%
Higher than 98.1% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
49/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Nov 8, 2022
Federal due date
None
No federal due date
Ransomware use
Not reported
Attributed actors
None named
Exploit & Defence Guidance
Exploit maturity
Proof of concept
Public exploit code
3
Proof-of-concept links
In-the-wild evidence
2
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2019-9810
- advisoryhttps://ubuntu.com/security/CVE-2019-9810
- advisoryhttps://www.cve.org/CVERecord?id=CVE-2019-9810
- advisoryhttps://www.mozilla.org/en-US/security/advisories/mfsa2019-09/#CVE-2019-9810
- advisoryhttps://www.mozilla.org/en-US/security/advisories/mfsa2019-12/#CVE-2019-9810
- advisoryRHSA-2019:0671
Description
Incorrect alias information in IonMonkey JIT compiler for Array.prototype.slice method may lead to missing bounds check and a buffer overflow. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
Known-Exploited Catalog Listings
| Catalog | Added | Remediation due | Ransomware use |
|---|---|---|---|
| Industry KEV feed | Nov 8, 2022 | n/a | Not reported |
Affected Products
164 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FirefoxMozilla | >= unspecified | 60.6.1 |
| ThunderbirdMozilla | >= unspecified | 60.6.1 |
| Enterprise LinuxRedhat | 8.0 | n/a |
| Enterprise Linux EusRedhat | 8.1, 8.2, 8.4 | n/a |
| Enterprise Linux Server AusRedhat | 8.2, 8.4 | n/a |
Patched Releases
Firefox
0:60.6.1-1.el6_10, 0:60.6.1-1.el7_6, 0:60.6.1-1.el8, 60.6.1-1.0.1.el6_10, 60.6.1-1.0.1.el7_6, 60.6.1-1.0.2.el8, 66.0.1-1, 66.0.1+build1-0ubuntu0.14.04.1, 66.0.1+build1-0ubuntu0.16.04.1, 66.0.1+build1-0ubuntu0.18.04.1, 66.0.1, 60.6.1
Firefox ESR
60.6.1, 128.5.1-1.1, 60.6.1-r0, 60.6.1esr-1, 60.6.1esr-1~deb8u1, 60.6.1esr-1~deb9u1
firefox-esr-branding-upstream
128.5.1-1.1
firefox-esr-translations-common
128.5.1-1.1
firefox-esr-translations-other
128.5.1-1.1
Thunderbird
60.6.1, 0:60.6.1-1.el6_10, 0:60.6.1-1.el7_6, 0:60.6.1-1.el8, 1:60.6.1+build2-0ubuntu0.14.04.1, 1:60.6.1+build2-0ubuntu0.16.04.1, 1:60.6.1+build2-0ubuntu0.18.04.1, 60.6.1-1, 60.6.1-1.0.1.el6_10, 60.6.1-1.0.1.el7_6, 60.6.1-1.0.1.el8, 60.6.1-1.amzn2.0.1
MozillaFirefox
60.6.1-135.1, 60.6.1-3.29.3, 60.6.1-lp150.3.45.1, 60.6.1esr-109.63.2, 92.0-1.2
MozillaFirefox-branding-upstream
60.6.1-135.1, 60.6.1-lp150.3.45.1, 92.0-1.2
MozillaFirefox-buildsymbols
60.6.1-135.1, 60.6.1-lp150.3.45.1
MozillaFirefox-devel
60.6.1-135.1, 60.6.1-3.29.3, 60.6.1-lp150.3.45.1, 60.6.1esr-109.63.2, 92.0-1.2
MozillaFirefox-translations-common
60.6.1-135.1, 60.6.1-3.29.3, 60.6.1-lp150.3.45.1, 60.6.1esr-109.63.2, 92.0-1.2
MozillaFirefox-translations-other
60.6.1-135.1, 60.6.1-3.29.3, 60.6.1-lp150.3.45.1, 92.0-1.2
MozillaThunderbird
60.6.1-3.28.1, 60.6.1-82.1, 60.6.1-89.1, 60.6.1-lp150.3.37.1, 91.1.1-1.1
MozillaThunderbird-buildsymbols
60.6.1-82.1, 60.6.1-89.1, 60.6.1-lp150.3.37.1
MozillaThunderbird-translations-common
60.6.1-3.28.1, 60.6.1-82.1, 60.6.1-89.1, 60.6.1-lp150.3.37.1, 91.1.1-1.1
MozillaThunderbird-translations-other
60.6.1-3.28.1, 60.6.1-82.1, 60.6.1-89.1, 60.6.1-lp150.3.37.1, 91.1.1-1.1
mozjs60
NA
Timeline
Publicly disclosed
Apr 26, 2019
Added to Industry KEV feed
Nov 8, 2022
Last updated
Aug 4, 2026
Weakness Type
- CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer
References
- advisorysecurity-tracker.debian.org · CVE-2019-9810
- advisoryubuntu.com · CVE-2019-9810
- advisorycve.org · CVERecord
- advisorymozilla.org · mfsa2019-09
- advisorymozilla.org · mfsa2019-12
FAQ
Common Questions.
Incorrect alias information in IonMonkey JIT compiler for Array.prototype.slice method may lead to missing bounds check and a buffer overflow.
Affected: Firefox (Mozilla) versions >= unspecified; Thunderbird (Mozilla) versions >= unspecified; Enterprise Linux (Redhat) versions 8.0, among others. The full list is in the CVE brief.
It is exploited in the wild, listed in Industry KEV feed since Nov 8, 2022.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
A public exploit is reported by tracking sources, but no code link is listed yet.
Fixed versions are available, including Firefox 0:60.6.1-1.el6_10, Firefox 0:60.6.1-1.el7_6, Firefox 0:60.6.1-1.el8.
Brandefense priority: patch immediately, because it is listed as exploited in the wild.
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