CVE-2017-5375Firefox Memory Corruption
JIT code allocation can allow for a bypass of ASLR and DEP protections leading to potential memory corruption attacks.
Published Jun 11, 2018 · Updated Aug 4, 2026 · Also known as DEBIAN-CVE-2017-5375, UBUNTU-CVE-2017-5375
Key Facts
Patch immediately- CVE-2017-5375 is a critical-severity vulnerability (CVSS 9.8 v3.1) affecting Firefox (Mozilla), Thunderbird (Mozilla), Debian Linux and 20 more products.
- It is not listed in any known-exploited vulnerabilities catalog. A public exploit is reported by tracking sources, but no code link is listed yet.
- EPSS estimates a 34% probability of exploitation in the next 30 days.
- Fixed versions are available, including Firefox 0:45.7.0-2.el5_11, Firefox 0:45.7.0-2.el6_8, Firefox 0:45.7.0-2.el7_3.
- Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
Scores
CVSS v3.1
9.8
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (30-day exploit likelihood)
34%
Higher than 98.3% of all scored CVEs
Exploit maturity
Proof of concept
ATLAS score
55/100
Publication score, see How it works
Exploitation Verdict
KEV listed
Not listed
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
6
Proof-of-concept links
In-the-wild evidence
0
Reports of active use
Advisories And Exploit References
- advisoryhttps://security-tracker.debian.org/tracker/CVE-2017-5375
- advisoryhttps://ubuntu.com/security/CVE-2017-5375
- advisoryhttps://www.cve.org/CVERecord?id=CVE-2017-5375
- advisoryhttps://www.mozilla.org/en-US/security/advisories/mfsa2017-01/#CVE-2017-5375
- advisoryhttps://www.mozilla.org/en-US/security/advisories/mfsa2017-03/#CVE-2017-5375
- advisoryRHSA-2017:0190
Description
JIT code allocation can allow for a bypass of ASLR and DEP protections leading to potential memory corruption attacks. This vulnerability affects Thunderbird < 45.7, Firefox ESR < 45.7, and Firefox < 51.
Affected Products
133 affected entries in total| Product | Affected versions | Fixed in |
|---|---|---|
| FirefoxMozilla | >= unspecified | 45.7.0 |
| ThunderbirdMozilla | >= unspecified | 45.7.0 |
| Debian LinuxDebian | 8.0 | n/a |
| Enterprise Linux DesktopRedhat | 5.0, 6.0, 7.0 | n/a |
| Enterprise Linux ServerRedhat | 5.0, 6.0, 7.0 | n/a |
Patched Releases
Firefox
0:45.7.0-2.el5_11, 0:45.7.0-2.el6_8, 0:45.7.0-2.el7_3, 45.7.0-1.0.1.el5_11, 45.7.0-1.0.1.el6_8, 45.7.0-1.0.1.el7_3, 51.0-1, 51.0.1-1, 51.0.1+build2-0ubuntu0.14.04.1, 51.0.1+build2-0ubuntu0.16.04.1, 51, 45.7.0
Firefox ESR
45.7, 128.5.1-1.1, 45.7.0-r0, 45.7.0esr-1, 45.7.0esr-1~deb7u1, 45.7.0esr-1~deb8u1
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
icedove
1:45.8.0-3~deb7u1, 1:45.8.0-3~deb8u1
Thunderbird
45.7.0, 0:45.7.0-1.el5_11, 0:45.7.0-1.el6_8, 0:45.7.0-1.el7_3, 1:45.7.0+build1-0ubuntu0.14.04.1, 1:45.7.0+build1-0ubuntu0.16.04.1, 45.7.0-1, 45.7.0-1.0.1.el5_11, 45.7.0-1.0.1.el6_8, 45.7.0-1.0.1.el7_3, 45.7
MozillaFirefox
45.7.0esr-65.2, 45.7.0esr-99.1, 51.0.1-50.2, 92.0-1.2
MozillaFirefox-branding-upstream
51.0.1-50.2, 92.0-1.2
MozillaFirefox-buildsymbols
51.0.1-50.2
MozillaFirefox-devel
45.7.0esr-65.2, 45.7.0esr-99.1, 51.0.1-50.2, 92.0-1.2
MozillaFirefox-translations
45.7.0esr-65.2, 45.7.0esr-99.1
MozillaFirefox-translations-common
51.0.1-50.2, 92.0-1.2
MozillaFirefox-translations-other
51.0.1-50.2, 92.0-1.2
MozillaThunderbird
45.7.0-23.1, 91.1.1-1.1
MozillaThunderbird-buildsymbols
45.7.0-23.1
MozillaThunderbird-devel
45.7.0-23.1
MozillaThunderbird-translations-common
45.7.0-23.1, 91.1.1-1.1
MozillaThunderbird-translations-other
45.7.0-23.1, 91.1.1-1.1
Timeline
Publicly disclosed
Jun 11, 2018
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-2017-5375
- advisoryubuntu.com · CVE-2017-5375
- advisorycve.org · CVERecord
- advisorymozilla.org · mfsa2017-01
- advisorymozilla.org · mfsa2017-03
FAQ
Common Questions.
JIT code allocation can allow for a bypass of ASLR and DEP protections leading to potential memory corruption attacks.
Affected: Firefox (Mozilla) versions >= unspecified; Thunderbird (Mozilla) versions >= unspecified; Debian Linux versions 8.0, among others. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
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 0:45.7.0-2.el5_11, Firefox 0:45.7.0-2.el6_8, Firefox 0:45.7.0-2.el7_3.
Brandefense priority: patch immediately, because public exploit code exists for a high-severity flaw.
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