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Vulnerability details: VCID-hbeu-y33r-7bfn
Vulnerability ID VCID-hbeu-y33r-7bfn
Aliases CVE-2019-9792
Summary The IonMonkey just-in-time (JIT) compiler can leak an internal JS_OPTIMIZED_OUT magic value to the running script during a bailout. This magic value can then be used by JavaScript to achieve memory corruption, which results in a potentially exploitable crash.
Status Published
Exploitability 2.0
Weighted Severity 9.0
Risk 10.0
Affected and Fixed Packages Package Details
Weaknesses (2)
CWE-203 Observable Discrepancy
CWE-787 Out-of-bounds Write
System Score Found at
cvssv3 9.8 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9792.json
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
epss 0.19723 https://api.first.org/data/v1/epss?cve=CVE-2019-9792
cvssv3 5.3 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 7.5 https://nvd.nist.gov/vuln/detail/CVE-2019-9792
cvssv3.1 9.8 https://nvd.nist.gov/vuln/detail/CVE-2019-9792
archlinux Critical https://security.archlinux.org/AVG-925
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-07
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-08
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2019-11
Reference id Reference type URL
http://packetstormsecurity.com/files/153106/Spidermonkey-IonMonkey-JS_OPTIMIZED_OUT-Value-Leak.html
https://access.redhat.com/errata/RHSA-2019:0966
https://access.redhat.com/errata/RHSA-2019:1144
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9792.json
https://api.first.org/data/v1/epss?cve=CVE-2019-9792
https://bugzilla.mozilla.org/show_bug.cgi?id=1532599
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-18506
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9788
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9790
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9791
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9792
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9793
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9795
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9796
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://www.mozilla.org/security/advisories/mfsa2019-07/
https://www.mozilla.org/security/advisories/mfsa2019-08/
https://www.mozilla.org/security/advisories/mfsa2019-11/
1690677 https://bugzilla.redhat.com/show_bug.cgi?id=1690677
ASA-201903-11 https://security.archlinux.org/ASA-201903-11
AVG-925 https://security.archlinux.org/AVG-925
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_eus:8.1:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_eus:8.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_eus:8.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_aus:8.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_aus:8.4:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_tus:8.2:*:*:*:*:*:*:*
cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:redhat:enterprise_linux_server_tus:8.4:*:*:*:*:*:*:*
CVE-2019-9792 Exploit https://bugs.chromium.org/p/project-zero/issues/detail?id=1794
CVE-2019-9792 Exploit https://gitlab.com/exploit-database/exploitdb/-/blob/main/exploits/multiple/dos/46939.txt
CVE-2019-9792 https://nvd.nist.gov/vuln/detail/CVE-2019-9792
mfsa2019-07 https://www.mozilla.org/en-US/security/advisories/mfsa2019-07
mfsa2019-08 https://www.mozilla.org/en-US/security/advisories/mfsa2019-08
mfsa2019-11 https://www.mozilla.org/en-US/security/advisories/mfsa2019-11
USN-3918-1 https://usn.ubuntu.com/3918-1/
USN-3918-2 https://usn.ubuntu.com/3918-2/
USN-3927-1 https://usn.ubuntu.com/3927-1/
Data source Exploit-DB
Date added May 29, 2019
Description Spidermonkey - IonMonkey Leaks JS_OPTIMIZED_OUT Magic Value to Script
Ransomware campaign use Known
Source publication date May 29, 2019
Exploit type dos
Platform multiple
Source update date May 29, 2019
Source URL https://bugs.chromium.org/p/project-zero/issues/detail?id=1794
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2019-9792.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9792
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2019-9792
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Exploit Prediction Scoring System (EPSS)
Percentile 0.9519
EPSS Score 0.19723
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:56.736093+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2019/mfsa2019-07.yml 37.0.0