CVE-2019-11757: canonical ubuntu_linux Use After Free

Modified

AliasesUBUNTU-CVE-2019-11757DEBIAN-CVE-2019-11757ALPINE-CVE-2019-11757

Published 08-01-2020Last modified 04-08-2024

Vulnerability summary

CVE-2019-11757 is a high (CVSS 8.8) Use After Free vulnerability in canonical ubuntu_linux. EPSS estimates a 1.33% chance of exploitation in the next 30 days, higher than 71% of scored vulnerabilities.

Priority

Routine

Not severe (CVSS 8.8, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?

CVSS score

8.8/10

010

High · v3.1 (NVD)

EPSS score

1.33%

0%100%

Low · -0.06 pp in 30 days

KEVNot listedNot listed by any tracked catalog.

RansomwareNot flaggedNo ransomware use recorded.

Public exploits0No public exploits recorded

Timeline

08-01-2020
PublishedVulnerability first disclosed.
04-08-2024
Last modifiedVulnerability information updated.

Description

When following the value's prototype chain, it was possible to retain a reference to a locale, delete it, and subsequently reference it. This resulted in a use-after-free and a potentially exploitable crash. This vulnerability affects Firefox < 70, Thunderbird < 68.2, and Firefox ESR < 68.2.

CVSS metrics

5 scores · 4 sources · 2 versions

v3.18.8v2.06.8

EPSS trend

Probability

1.33%

Chance of exploitation in the next 30 days

Percentile

71%

Versus all other CVEs

30-day change

Decrease -0.06 pp

From 1.39% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs

CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

CWE-416Use After FreeThe product reuses or references memory after it has been freed. At some point afterward, the memory may be allocated again and saved in another pointer, while the original pointer references a location somewhere within the new allocation. Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.

Affected systems

Version check

Known conditions: network-reachable, no authentication, user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu4 products

firefox< 70.0+build2-0ubuntu0.16.04.1 | < 70.0+build2-0ubuntu0.18.04.1 | < 70.0+build2-0ubuntu1
mozjs38All versions (No fix recorded)
mozjs52All versions (No fix recorded)
thunderbird< 1:68.7.0+build1-0ubuntu0.16.04.2 | < 1:68.2.1+build1-0ubuntu0.18.04.1

Alpine3 products