HIGH
Mozilla: DOS attack through long username in URL (MFSA 2017-18)
Published Jun 11, 2018
7.5
HIGHCVSS 3.0
EPSS 14.12%
Description
If a long user name is used in a username/password combination in a site URL (such as " http://UserName:Password@example.com"), the resulting modal prompt will hang in a non-responsive state or crash, causing a denial of service. This vulnerability affects Firefox < 55.
Affected products
-
- Version unspecifiedStatusaffectedConstraints<55
- Version
No data.
Red Hat Enterprise Linux 6
firefox
Not affected
Red Hat Enterprise Linux 7
firefox
Not affected
| Product | Package | State | Advisory |
|---|---|---|---|
| Red Hat Enterprise Linux 6 | firefox | Not affected | n/a |
| Red Hat Enterprise Linux 7 | firefox | Not affected | n/a |
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
No CVSS v3.1 score for this CVE.
7.5 HIGH NVD
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact None
Availability Impact High
5.0 MEDIUM NVD
AV:N/AC:L/Au:N/C:N/I:N/A:P
Access Vector Network
Access Complexity Low
Authentication None
Confidentiality Impact None
Integrity Impact None
Availability Impact Partial
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
14.12% 0.14120
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.14120
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 (38 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 14.12% (0.14120) | 96.46th | v5 (v2026.06.15) |
| Sep 22, 2026 | 14.12% (0.14120) | 96.40th | v5 (v2026.06.15) |
| Sep 21, 2026 | 10.34% (0.10342) | 95.56th | v5 (v2026.06.15) |
| Sep 20, 2026 | 14.12% (0.14120) | 96.40th | v5 (v2026.06.15) |
| Sep 6, 2026 | 13.53% (0.13529) | 96.19th | v5 (v2026.06.15) |
| Sep 5, 2026 | 9.90% (0.09903) | 95.32th | v5 (v2026.06.15) |
| Aug 30, 2026 | 13.53% (0.13529) | 96.17th | v5 (v2026.06.15) |
| Aug 28, 2026 | 9.90% (0.09903) | 95.29th | v5 (v2026.06.15) |
| Aug 24, 2026 | 13.53% (0.13529) | 96.15th | v5 (v2026.06.15) |
| Aug 23, 2026 | 9.90% (0.09903) | 95.28th | v5 (v2026.06.15) |
| Jun 15, 2026 | 13.70% (0.13697) | 96.00th | v5 (v2026.06.15) |
| Nov 21, 2025 | 6.90% (0.06903) | 91.00th | v4 (v2025.03.14) |
| Nov 18, 2025 | 8.08% (0.08080) | 91.27th | v4 (v2025.03.14) |
| Aug 29, 2025 | 6.90% (0.06903) | 91.02th | v4 (v2025.03.14) |
| Aug 12, 2025 | 14.11% (0.14112) | 94.06th | v4 (v2025.03.14) |
| Jun 29, 2025 | 15.23% (0.15230) | 94.27th | v4 (v2025.03.14) |
| May 12, 2025 | 17.02% (0.17020) | 94.58th | v4 (v2025.03.14) |
| Mar 30, 2025 | 19.58% (0.19582) | 94.93th | v4 (v2025.03.14) |
| Mar 29, 2025 | 41.78% (0.41776) | 96.14th | v4 (v2025.03.14) |
| Mar 17, 2025 | 19.87% (0.19873) | 94.99th | v4 (v2025.03.14) |
| Dec 12, 2024 | 3.46% (0.03459) | 91.85th | v3 (v2023.03.01) |
| Nov 2, 2023 | 3.46% (0.03459) | 90.43th | v3 (v2023.03.01) |
| Sep 20, 2023 | 4.86% (0.04857) | 91.81th | v3 (v2023.03.01) |
| Jul 29, 2023 | 4.88% (0.04878) | 91.70th | v3 (v2023.03.01) |
| Jul 10, 2023 | 5.25% (0.05246) | 91.95th | v3 (v2023.03.01) |
| Jun 23, 2023 | 4.05% (0.04052) | 90.86th | v3 (v2023.03.01) |
| Jun 5, 2023 | 7.19% (0.07190) | 93.03th | v3 (v2023.03.01) |
| May 21, 2023 | 7.18% (0.07178) | 92.99th | v3 (v2023.03.01) |
| May 3, 2023 | 8.31% (0.08306) | 93.39th | v3 (v2023.03.01) |
| Apr 1, 2023 | 8.84% (0.08839) | 93.52th | v3 (v2023.03.01) |
| Mar 7, 2023 | 8.25% (0.08247) | 93.32th | v3 (v2023.03.01) |
| Mar 6, 2023 | 8.94% (0.08944) | 94.01th | v2 (v2022.01.01) |
| Apr 1, 2022 | 8.94% (0.08944) | 93.48th | v2 (v2022.01.01) |
| Feb 4, 2022 | 8.94% (0.08944) | 83.03th | v2 (v2022.01.01) |
| Feb 3, 2022 | 6.60% (0.06599) | 83.03th | v1 |
| Jan 6, 2022 | 6.60% (0.06599) | 82.86th | v1 |
| Sep 1, 2021 | 6.60% (0.06599) | 90.53th | v1 |
| Apr 14, 2021 | 6.60% (0.06599) | 0.00th | v1 |
Weaknesses (1)
References (10)
- http://www.securityfocus.com/bid/100401 vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry
- http://www.securitytracker.com/id/1039124 vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry
- https://access.redhat.com/security/cve/CVE-2017-7783 Vendor Advisory
- https://bugzilla.mozilla.org/show_bug.cgi?id=1360842 x_refsource_CONFIRMExploitIssue TrackingPatch
- https://bugzilla.redhat.com/show_bug.cgi?id=1479176 Issue Tracking
- https://nvd.nist.gov/vuln/detail/CVE-2017-7783
- https://www.cve.org/CVERecord?id=CVE-2017-7783
- https://www.exploit-db.com/exploits/43020/ exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry
- https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7783
- https://www.mozilla.org/security/advisories/mfsa2017-18/ x_refsource_CONFIRMVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| http://www.securityfocus.com/bid/100401 | vdb-entryx_refsource_BIDThird Party AdvisoryVDB Entry | |
| http://www.securitytracker.com/id/1039124 | vdb-entryx_refsource_SECTRACKThird Party AdvisoryVDB Entry | |
| https://access.redhat.com/security/cve/CVE-2017-7783 | Vendor Advisory | |
| https://bugzilla.mozilla.org/show_bug.cgi?id=1360842 | x_refsource_CONFIRMExploitIssue TrackingPatch | |
| https://bugzilla.redhat.com/show_bug.cgi?id=1479176 | Issue Tracking | |
| https://nvd.nist.gov/vuln/detail/CVE-2017-7783 | ||
| https://www.cve.org/CVERecord?id=CVE-2017-7783 | ||
| https://www.exploit-db.com/exploits/43020/ | exploitx_refsource_EXPLOIT-DBThird Party AdvisoryVDB Entry | |
| https://www.mozilla.org/en-US/security/advisories/mfsa2017-18/#CVE-2017-7783 | ||
| https://www.mozilla.org/security/advisories/mfsa2017-18/ | x_refsource_CONFIRMVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mozilla
Published Jun 11, 2018
Updated Aug 5, 2024
Reserved Apr 12, 2017
Link CVE-2017-7783
CISA Vulnrichment
Updated n/a