CVE-2020-15652 — Mozilla: Potential leak of redirect targets when loading scripts in a worker

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MEDIUM

Mozilla: Potential leak of redirect targets when loading scripts in a worker

Published Aug 10, 2020

6.5

MEDIUM

CVSS 3.1

EPSS 1.26%

Description

By observing the stack trace for JavaScript errors in web workers, it was possible to leak the result of a cross-origin redirect. This applied only to content that can be parsed as script. This vulnerability affects Firefox < 79, Firefox ESR < 68.11, Firefox ESR < 78.1, Thunderbird < 68.11, and Thunderbird < 78.1.

Affected products

Vendor Mozilla Product Firefox Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <79
Vendor Mozilla Product Firefox ESR Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <68.11
- Version
  unspecified
  Status
  affected
  Constraints
  <78.1
Vendor Mozilla Product Thunderbird Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <68.11
- Version
  unspecified
  Status
  affected
  Constraints
  <78.1

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Mozilla

Firefox

n/a

Version	Status	Constraints
unspecified	affected	<79

Mozilla

Firefox ESR

n/a

Version	Status	Constraints
unspecified	affected	<68.11
unspecified	affected	<78.1

Mozilla

Thunderbird

n/a

Version	Status	Constraints
unspecified	affected	<68.11
unspecified	affected	<78.1

Red Hat Enterprise Linux 6

firefox-0:68.11.0-1.el6_10

Fixed · RHSA-2020:3233
Red Hat Enterprise Linux 6

thunderbird-0:68.11.0-1.el6_10

Fixed · RHSA-2020:3345
Red Hat Enterprise Linux 7

firefox-0:68.11.0-1.el7_8

Fixed · RHSA-2020:3253
Red Hat Enterprise Linux 7

thunderbird-0:68.11.0-1.el7_8

Fixed · RHSA-2020:3344
Red Hat Enterprise Linux 8

firefox-0:68.11.0-1.el8_2

Fixed · RHSA-2020:3241
Red Hat Enterprise Linux 8

thunderbird-0:68.11.0-1.el8_2

Fixed · RHSA-2020:3341
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

firefox-0:68.11.0-1.el8_0

Fixed · RHSA-2020:3229
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions

thunderbird-0:68.11.0-1.el8_0

Fixed · RHSA-2020:3343
Red Hat Enterprise Linux 8.1 Extended Update Support

firefox-0:68.11.0-1.el8_1

Fixed · RHSA-2020:3254
Red Hat Enterprise Linux 8.1 Extended Update Support

thunderbird-0:68.11.0-1.el8_1

Fixed · RHSA-2020:3342
Red Hat Enterprise Linux 5

firefox

Out of support scope
Red Hat Enterprise Linux 5

thunderbird

Out of support scope

Product	Package	State	Advisory
Red Hat Enterprise Linux 6	firefox-0:68.11.0-1.el6_10	Fixed	RHSA-2020:3233
Red Hat Enterprise Linux 6	thunderbird-0:68.11.0-1.el6_10	Fixed	RHSA-2020:3345
Red Hat Enterprise Linux 7	firefox-0:68.11.0-1.el7_8	Fixed	RHSA-2020:3253
Red Hat Enterprise Linux 7	thunderbird-0:68.11.0-1.el7_8	Fixed	RHSA-2020:3344
Red Hat Enterprise Linux 8	firefox-0:68.11.0-1.el8_2	Fixed	RHSA-2020:3241
Red Hat Enterprise Linux 8	thunderbird-0:68.11.0-1.el8_2	Fixed	RHSA-2020:3341
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions	firefox-0:68.11.0-1.el8_0	Fixed	RHSA-2020:3229
Red Hat Enterprise Linux 8.0 Update Services for SAP Solutions	thunderbird-0:68.11.0-1.el8_0	Fixed	RHSA-2020:3343
Red Hat Enterprise Linux 8.1 Extended Update Support	firefox-0:68.11.0-1.el8_1	Fixed	RHSA-2020:3254
Red Hat Enterprise Linux 8.1 Extended Update Support	thunderbird-0:68.11.0-1.el8_1	Fixed	RHSA-2020:3342
Red Hat Enterprise Linux 5	firefox	Out of support scope	n/a
Red Hat Enterprise Linux 5	thunderbird	Out of support scope	n/a

Remediation

No remediation recorded yet.

Metrics

1.26% 0.01263

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 3, 2026.

EPSS probability 0.01263

Score over time

2021–2026

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Percentile over time

EPSS v1
EPSS v2
EPSS v3
EPSS v4
EPSS v5

Table of values (22 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 3, 2026	1.26% (0.01263)	68.68th	v5 (v2026.06.15)
Jun 15, 2026	1.26% (0.01263)	65.74th	v5 (v2026.06.15)
Mar 17, 2025	0.70% (0.00703)	70.38th	v4 (v2025.03.14)
Dec 12, 2024	0.33% (0.00330)	71.92th	v3 (v2023.03.01)
Jul 17, 2024	0.34% (0.00335)	71.53th	v3 (v2023.03.01)
Jul 1, 2024	0.29% (0.00293)	69.39th	v3 (v2023.03.01)
Jun 14, 2024	0.30% (0.00305)	69.88th	v3 (v2023.03.01)
May 30, 2024	0.35% (0.00347)	71.66th	v3 (v2023.03.01)
Feb 8, 2024	0.29% (0.00291)	68.17th	v3 (v2023.03.01)
May 8, 2023	0.29% (0.00291)	64.33th	v3 (v2023.03.01)
Apr 26, 2023	0.25% (0.00247)	61.14th	v3 (v2023.03.01)
Mar 31, 2023	0.22% (0.00221)	58.59th	v3 (v2023.03.01)
Mar 17, 2023	0.15% (0.00155)	50.14th	v3 (v2023.03.01)
Mar 7, 2023	0.14% (0.00137)	47.29th	v3 (v2023.03.01)
Mar 6, 2023	1.54% (0.01537)	74.52th	v2 (v2022.01.01)
Feb 23, 2023	1.54% (0.01537)	74.48th	v2 (v2022.01.01)
Apr 1, 2022	1.54% (0.01537)	72.41th	v2 (v2022.01.01)
Feb 4, 2022	12.26% (0.12262)	89.36th	v2 (v2022.01.01)
Feb 3, 2022	9.98% (0.09982)	87.28th	v1
Jan 6, 2022	9.98% (0.09982)	87.13th	v1
Sep 1, 2021	2.41% (0.02412)	78.34th	v1
Apr 14, 2021	2.41% (0.02412)	0.00th	v1

Weaknesses (2)

CWE-209

CWE-346

References (15)

http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.html
vendor-advisoryx_refsource_SUSEThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html
vendor-advisoryx_refsource_SUSEThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00032.html
vendor-advisoryx_refsource_SUSEBroken Link
https://access.redhat.com/security/cve/CVE-2020-15652
Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1634872
x_refsource_MISCIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1861570
Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2020-15652
https://usn.ubuntu.com/4443-1/
vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2020-15652
https://www.mozilla.org/en-US/security/advisories/mfsa2020-31/#CVE-2020-15652
https://www.mozilla.org/security/advisories/mfsa2020-30/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-31/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-32/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-33/
x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-35/
x_refsource_MISCVendor Advisory

Link	Providers	Tags
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00022.html		vendor-advisoryx_refsource_SUSEThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.html		vendor-advisoryx_refsource_SUSEThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-08/msg00032.html		vendor-advisoryx_refsource_SUSEBroken Link
https://access.redhat.com/security/cve/CVE-2020-15652		Vendor Advisory
https://bugzilla.mozilla.org/show_bug.cgi?id=1634872		x_refsource_MISCIssue TrackingVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1861570		Issue Tracking
https://nvd.nist.gov/vuln/detail/CVE-2020-15652
https://usn.ubuntu.com/4443-1/		vendor-advisoryx_refsource_UBUNTUThird Party Advisory
https://www.cve.org/CVERecord?id=CVE-2020-15652
https://www.mozilla.org/en-US/security/advisories/mfsa2020-31/#CVE-2020-15652
https://www.mozilla.org/security/advisories/mfsa2020-30/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-31/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-32/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-33/		x_refsource_MISCVendor Advisory
https://www.mozilla.org/security/advisories/mfsa2020-35/		x_refsource_MISCVendor Advisory