CVE-2017-7756: debian debian_linux Use After Free

CVSS: 9.8v3.0CriticalModified

AliasesUBUNTU-CVE-2017-7756DEBIAN-CVE-2017-7756

Published 11-06-2018Last modified 05-08-2024

Vulnerability summary

CVE-2017-7756 is a critical (CVSS 9.8) Use After Free vulnerability in debian debian_linux. EPSS estimates a 2.58% chance of exploitation in the next 30 days, higher than 84.9% of scored vulnerabilities.

Overall risk

70/100

0100

High · default modelHow is this calculated?

CVSS score

9.8/10

010

Critical · v3.0 (NVD)

EPSS score

2.58%

0%100%

Low · -0.05 pp in 30 days

KEVNot listedIn no KEV catalog

RansomwareNone recordedNo known use recorded

Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 15 · Related 6

DLA-1007-1 DLA-991-1 DSA-3881-1 DSA-3918-1 MGASA-2017-0178 MGASA-2017-0180+9 more

Timeline

11-06-2018
PublishedVulnerability first disclosed.
05-08-2024
Last modifiedVulnerability information updated.

Description

A use-after-free and use-after-scope vulnerability when logging errors from headers for XML HTTP Requests (XHR). This could result in a potentially exploitable crash. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

CVSS metrics

4 scores · 3 sources · 2 versions

v3.09.8v2.07.5

EPSS trend

Probability

2.58%

Chance of exploitation in the next 30 days

Percentile

85%

Versus all other CVEs

30-day change

-0.05 pp

From 2.63% on 18-09-2026

18-09-202618-10-2026

EPSS score

2.58%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

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 Any operations using the original pointer are no longer valid because the memory "belongs" to the code that operates on the new pointer.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

Mozilla3 products

firefox≥ unspecified, < 54 | < 52.2.0 | < 54.0
firefox_esr≥ unspecified, < 52.2
thunderbird≥ unspecified, < 52.2 | < 52.2.0

Debian2 products

firefox-esr< 52.2.0esr-1
debian_linuxEOL8.0 | 9.0

Ubuntu2 products

firefox< 54.0+build3-0ubuntu0.14.04.1 | < 54.0+build3-0ubuntu0.16.04.1
thunderbird< 1:52.2.1+build1-0ubuntu0.14.04.1 | < 1:52.2.1+build1-0ubuntu0.16.04.1

3 vendors · 7 products

References

16 links

www.securityfocus.com/bid/99057VDB EntryX Refsource BIDThird Party Advisory
bugzilla.mozilla.org/show_bug.cgi?id=1366595X Refsource CONFIRMIssue TrackingVendor Advisory
www.mozilla.org/security/advisories/mfsa2017-15/X Refsource CONFIRMVendor Advisory
www.debian.org/security/2017/dsa-3918Vendor AdvisoryX Refsource DEBIANThird Party Advisory
www.securitytracker.com/id/1038689VDB EntryX Refsource SECTRACKThird Party Advisory
www.debian.org/security/2017/dsa-3881Vendor AdvisoryX Refsource DEBIANThird Party Advisory
access.redhat.com/errata/RHSA-2017:1440Vendor AdvisoryX Refsource REDHATThird Party Advisory
access.redhat.com/errata/RHSA-2017:1561Vendor AdvisoryX Refsource REDHATThird Party Advisory
www.mozilla.org/security/advisories/mfsa2017-17/X Refsource CONFIRMVendor Advisory
www.mozilla.org/security/advisories/mfsa2017-16/X Refsource CONFIRMVendor Advisory

Show all 16 references

ubuntu.com/security/CVE-2017-7756REPORT
www.mozilla.org/en-US/security/advisories/mfsa2017-15/REPORT
ubuntu.com/security/notices/USN-3315-1Advisory
ubuntu.com/security/notices/USN-3321-1Advisory
www.cve.org/CVERecord?id=CVE-2017-7756REPORT
security-tracker.debian.org/tracker/CVE-2017-7756Advisory

Vulnerability summary

Advisory lineage

Timeline

Description

CVSS metrics

EPSS trend

Known exploited

Public exploits

Weaknesses

Affected systems

References

Related vulnerabilities