CVE-2018-18498
A potential vulnerability leading to an integer overflow can occur during buffer size calculations for images when a raw value is used instead of the checked value.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.03%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
A potential vulnerability leading to an integer overflow can occur during buffer size calculations for images when a raw value is used instead of the checked value. This leads to a possible out-of-bounds write. This vulnerability affects Thunderbird < 60.4, Firefox ESR < 60.4, and Firefox < 64.
- CVSS 3.0
- 9.8 CRITICALCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 4.03% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190, CWE-787
- Affected
- mozilla/firefox · mozilla/firefox esr · mozilla/thunderbird · debian/debian linux · canonical/ubuntu linux · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux server tus · redhat/enterprise linux workstation
- Source
- security@mozilla.org
EPSS 4.0% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://www.securityfocus.com/bid/106168Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3831Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3833Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0159Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0160Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1500011Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00002.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201903-04Third Party Advisory
- https://usn.ubuntu.com/3844-1/Third Party Advisory
- https://usn.ubuntu.com/3868-1/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4354Third Party Advisory
- https://www.debian.org/security/2019/dsa-4362Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-29/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-30/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-31/Vendor Advisory
- http://www.securityfocus.com/bid/106168Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2018:3831Third Party Advisory
- https://access.redhat.com/errata/RHSA-2018:3833Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0159Third Party Advisory
- https://access.redhat.com/errata/RHSA-2019:0160Third Party Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1500011Issue Tracking, Permissions Required, Vendor Advisory
- https://lists.debian.org/debian-lts-announce/2018/12/msg00002.htmlMailing List, Third Party Advisory
- https://security.gentoo.org/glsa/201903-04Third Party Advisory
- https://usn.ubuntu.com/3844-1/Third Party Advisory
- https://usn.ubuntu.com/3868-1/Third Party Advisory
- https://www.debian.org/security/2018/dsa-4354Third Party Advisory
- https://www.debian.org/security/2019/dsa-4362Third Party Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-29/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-30/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2018-31/Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.