CVE-2018-18498: canonical ubuntu_linux Integer Overflow or Wraparound
Vulnerability summary
CVE-2018-18498 is a critical (CVSS 9.8) Integer Overflow or Wraparound vulnerability in canonical ubuntu_linux. EPSS estimates a 4.03% chance of exploitation in the next 30 days, higher than 90.6% of scored vulnerabilities.
Severe, CVSS 9.8 (NVD); no exploitation reported by the 5 checked sources; EPSS 4% (FIRST, 03-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 19 · Related 10Timeline
- 28-02-2019PublishedVulnerability first disclosed.
- 05-08-2024Last modifiedVulnerability information updated.
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 metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- OSV · DebianEcosystem advisory · calculated9.8CriticalCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS trend
Probability
4.03%
Chance of exploitation in the next 30 days
Percentile
91%
Versus all other CVEs
30-day change
No change 0.00 pp
From 4.03% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root cause- CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
- CWE-787Out-of-bounds WriteThe product writes data past the end, or before the beginning, of the intended buffer.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Redhat6 products
- enterprise_linux_desktop6.0 | 7.0
- enterprise_linux_server6.0 | 7.0
- enterprise_linux_server_aus7.6
- enterprise_linux_server_eus7.6
- enterprise_linux_server_tus7.6
Debian3 products
- firefox-esr< 60.4.0esr-1
- thunderbird< 1:60.4.0-1
- debian_linuxEOL8.0 | 9.0
Mozilla3 products
- firefox≥ unspecified, < 64 | < 64.0
- firefox esr≥ unspecified, < 60.4 | < 60.4
- thunderbird≥ unspecified, < 60.4 | < 60.4
Ubuntu2 products
- firefox< 64.0+build3-0ubuntu0.14.04.1 | < 64.0+build3-0ubuntu0.16.04.1 | < 64.0+build3-0ubuntu0.18.04.1
- thunderbird< 1:60.4.0+build2-0ubuntu0.14.04.1 | < 1:60.4.0+build2-0ubuntu0.16.04.1 | < 1:60.4.0+build2-0ubuntu0.18.04.1
Canonical1 product
- ubuntu_linuxEOL14.04 | 16.04 | 18.04 | 18.10
5 vendors · 15 products
References
22 links
lists.debian.org/debian-lts-announce/2018/12/msg00002.htmlMailing ListX Refsource MLISTThird Party Advisory
Show all 22 references
- bugzilla.mozilla.org/show_bug.cgi?id=1500011X Refsource CONFIRMIssue TrackingPermissions RequiredVendor Advisory