CVE-2019-11743: Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload even
Noroxi assessment
Priority: Monitor (action score 15/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 1.7% (FIRST EPSS); higher than 78.4% of all records.
- Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
- Fixed version: firefox-esr (Debian:10) 60.9.0esr-1~deb10u1; thunderbird (Debian:10) 1:60.9.0-1~deb10u1; firefox-esr (Debian:12) 68.1.0esr-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to firefox-esr (Debian:10) 60.9.0esr-1~deb10u1; thunderbird (Debian:10) 1:60.9.0-1~deb10u1; firefox-esr (Debian:12) 68.1.0esr-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
Primary sources: NVD · CVE.org · FIRST EPSS
Navigation events were not fully adhering to the W3C's "Navigation-Timing Level 2" draft specification in some instances for the unload event, which restricts access to detailed timing attributes to only be same-origin. This resulted in potential cross-origin information exposure of history through timing side-channel attacks. This vulnerability affects Firefox < 69, Thunderbird < 68.1, Thunderbird < 60.9, Firefox ESR < 60.9, and Firefox ESR < 68.1.
- Published
- Sep 27, 2019
- Updated
- Jun 16, 2026
- EPSS
- 1.7% · 78th percentile
- CWE
- CWE-203
Report tools
Action score
15
Monitor
Low priority for now.
- CVSS
- 14 / 40 · 3.7 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 1 / 30 · 1.7%
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| mozilla | firefox | cpe:2.3:a:mozilla:firefox |
| mozilla | firefox esr | cpe:2.3:a:mozilla:firefox_esr |
| mozilla | thunderbird | cpe:2.3:a:mozilla:thunderbird |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- mozilla firefoxbefore 60.9.0
- mozilla firefoxbefore 69.0
- mozilla firefox esr68.0 and later · before 68.1.0
- mozilla thunderbirdbefore 60.9.0
- mozilla thunderbird68.0 and later · before 68.1.0
Versions reported by the vendor
Affected version ranges reported by the assigning authority (mozilla). Independent of NVD's CPE analysis and usually ahead of it.
Mozilla Firefox
- unspecified and later · before 69affected
Mozilla Firefox ESR
- unspecified and later · before 60.9affected
- unspecified and later · before 68.1affected
Mozilla Thunderbird
- unspecified and later · before 68.1affected
- unspecified and later · before 60.9affected
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:10 | firefox-esr | before 60.9.0esr-1~deb10u1 | 60.9.0esr-1~deb10u1 |
| Debian:10 | thunderbird | before 1:60.9.0-1~deb10u1 | 1:60.9.0-1~deb10u1 |
| Debian:12 | firefox-esr | before 68.1.0esr-1 | 68.1.0esr-1 |
| Debian:12 | thunderbird | before 1:60.9.0-1 | 1:60.9.0-1 |
| Debian:8 | firefox-esr | before 60.9.0esr-1~deb8u1 | 60.9.0esr-1~deb8u1 |
| Debian:8 | thunderbird | before 1:60.9.0-1~deb8u1 | 1:60.9.0-1~deb8u1 |
| Debian:9 | firefox-esr | before 60.9.0esr-1~deb9u1 | 60.9.0esr-1~deb9u1 |
| Debian:9 | thunderbird | before 1:60.9.0-1~deb9u1 | 1:60.9.0-1~deb9u1 |
| openSUSE:Leap 15.0 | MozillaFirefox | before 68.1.0-lp150.3.66.1 | 68.1.0-lp150.3.66.1 |
| openSUSE:Leap 15.1 | MozillaFirefox | before 68.1.0-lp151.2.14.1 | 68.1.0-lp151.2.14.1 |
| Red Hat:enterprise_linux:6::client | firefox | before 0:60.9.0-1.el6_10 | 0:60.9.0-1.el6_10 |
| Red Hat:enterprise_linux:6::client | firefox-debuginfo | before 0:60.9.0-1.el6_10 | 0:60.9.0-1.el6_10 |
| Red Hat:enterprise_linux:6::client | thunderbird | before 0:60.9.0-1.el6_10 | 0:60.9.0-1.el6_10 |
| Red Hat:enterprise_linux:6::client | thunderbird-debuginfo | before 0:60.9.0-1.el6_10 | 0:60.9.0-1.el6_10 |
| Red Hat:enterprise_linux:7::client | firefox | before 0:60.9.0-1.el7_7 | 0:60.9.0-1.el7_7 |
| Red Hat:enterprise_linux:7::client | firefox-debuginfo | before 0:60.9.0-1.el7_7 | 0:60.9.0-1.el7_7 |
| Red Hat:enterprise_linux:7::client | thunderbird | before 0:60.9.0-1.el7_7 | 0:60.9.0-1.el7_7 |
| Red Hat:enterprise_linux:7::client | thunderbird-debuginfo | before 0:60.9.0-1.el7_7 | 0:60.9.0-1.el7_7 |
| Red Hat:enterprise_linux:8::appstream | firefox | before 0:68.1.0-1.el8_0 | 0:68.1.0-1.el8_0 |
| Red Hat:enterprise_linux:8::appstream | firefox-debuginfo | before 0:68.1.0-1.el8_0 | 0:68.1.0-1.el8_0 |
| Red Hat:enterprise_linux:8::appstream | firefox-debugsource | before 0:68.1.0-1.el8_0 | 0:68.1.0-1.el8_0 |
| Red Hat:enterprise_linux:8::appstream | thunderbird | before 0:60.9.0-2.el8_0 | 0:60.9.0-2.el8_0 |
| Red Hat:enterprise_linux:8::appstream | thunderbird-debuginfo | before 0:60.9.0-2.el8_0 | 0:60.9.0-2.el8_0 |
| Red Hat:enterprise_linux:8::appstream | thunderbird-debugsource | before 0:60.9.0-2.el8_0 | 0:60.9.0-2.el8_0 |
+6
Same product
mozilla: all recordsOther highest-scoring records for the same primary product.
- CVE-2010-3765Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before 3.1.6 and 3.0.x before 3.0.10, and SeaMonkey 2.x befKEV94Now
- CVE-2019-11708Insufficient vetting of parameters passed with the Prompt:Open IPC message between child and parent processes can result in the non-sandboxeKEV87Now
- CVE-2015-4495The PDF reader in Mozilla Firefox before 39.0.3, Firefox ESR 38.x before 38.1.1, and Firefox OS before 2.2 allows remote attackers to bypassKEV86Now
Published before and after this one in the same product
- ← EarlierCVE-2019-11741Sep 27, 2019 · A compromised sandboxed content process can perform a Universal Cross-site Scripting (UXSS) attack on content from any site it can cause to 24Monitor
- ← EarlierCVE-2019-11742Sep 27, 2019 · A same-origin policy violation occurs allowing the theft of cross-origin images through a combination of SVG filters and a <canvas> el27Monitor
- Later →CVE-2019-11744Sep 27, 2019 · Some HTML elements, such as <title> and <textarea>, can contain literal angle brackets without treating them as markup.24Monitor
Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| debian:firefox-esr | 68.1.0esr-1 · Debian:12 | Package registry (OSV) |
| debian:thunderbird | 1:60.9.0-1 · Debian:12 | Package registry (OSV) |
| opensuse:MozillaFirefox | 68.1.0-lp151.2.14.1 · openSUSE:Leap 15.1 | Package registry (OSV) |
| red hat:firefox | 0:68.1.0-1.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:firefox-debuginfo | 0:68.1.0-1.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:firefox-debugsource | 0:68.1.0-1.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| red hat:thunderbird | 0:60.9.0-1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:thunderbird-debuginfo | 0:60.9.0-1.el7_7 · Red Hat:enterprise_linux:7::client | Package registry (OSV) |
| red hat:thunderbird-debugsource | 0:60.9.0-2.el8_0 · Red Hat:enterprise_linux:8::appstream | Package registry (OSV) |
| suse:firefox-glib2 | 2.54.3-2.11.1 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:firefox-gtk3 | 3.10.9-2.12.2 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:MozillaFirefox | 60.9.0esr-78.46.2 · SUSE:Linux Enterprise Server 11 SP4-LTSS | Package registry (OSV) |
| suse:MozillaFirefox-branding-SLE | 68-4.8.5 · SUSE:Linux Enterprise Module for Desktop Applications 15 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
No history yet (it accumulates with the daily EPSS job).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-19-149 · Sep 16, 2019(Mozilla Thunderbird için Güvenlik Güncellemesi Yayınladı)
Technical details
Attack conditions
- Anyone who can reach it over the internet can trigger it.
- No account or password is required.
- No user action is required.
- Special conditions such as timing or configuration are required.
If successful
- Confidentiality
- low · data can be read
- Integrity
- none
- Availability
- none
- Attack vector
- Network
- Attack complexity
- High
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- Low
- Integrity impact
- None
- Availability impact
- None
Weakness class (CWE)
CWE-203 · Observable DiscrepancyCVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
nvd-primary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
Attack patterns (CAPEC)
ATT&CK techniques
—
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (11 more)Show less
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00010.html
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00011.html
- lists.opensuse.org/opensuse-security-announce/2019-10/msg00017.html
- bugzilla.mozilla.org/show_bug.cgi?id=1560495
- security.gentoo.org/glsa/201911-07
- usn.ubuntu.com/4150-1/
- www.mozilla.org/security/advisories/mfsa2019-25/
- www.mozilla.org/security/advisories/mfsa2019-26/
- www.mozilla.org/security/advisories/mfsa2019-27/
- www.mozilla.org/security/advisories/mfsa2019-29/
- www.mozilla.org/security/advisories/mfsa2019-30/
Vendor advisories and official records. Exploit/PoC links are deliberately left out.