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Vulnerability details: VCID-kd1q-6ntp-t3ct
Vulnerability ID VCID-kd1q-6ntp-t3ct
Aliases CVE-2025-0239
Summary When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site.
Status Published
Exploitability 0.5
Weighted Severity 8.0
Risk 4.0
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-601 URL Redirection to Untrusted Site ('Open Redirect')
System Score Found at
cvssv3 5.4 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-0239.json
epss 0.00029 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00029 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.0003 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00035 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00038 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
epss 0.00044 https://api.first.org/data/v1/epss?cve=CVE-2025-0239
cvssv3.1 4 https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
ssvc Track https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
cvssv3.1 4 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-01
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2025-02
generic_textual high https://www.mozilla.org/en-US/security/advisories/mfsa2025-04
generic_textual none https://www.mozilla.org/en-US/security/advisories/mfsa2025-05
cvssv3.1 4 https://www.mozilla.org/security/advisories/mfsa2025-01/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-01/
cvssv3.1 4 https://www.mozilla.org/security/advisories/mfsa2025-02/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-02/
cvssv3.1 4 https://www.mozilla.org/security/advisories/mfsa2025-04/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-04/
cvssv3.1 4 https://www.mozilla.org/security/advisories/mfsa2025-05/
ssvc Track https://www.mozilla.org/security/advisories/mfsa2025-05/
Reference id Reference type URL
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-0239.json
https://api.first.org/data/v1/epss?cve=CVE-2025-0239
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-0239
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
2336170 https://bugzilla.redhat.com/show_bug.cgi?id=2336170
cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
CVE-2025-0239 https://nvd.nist.gov/vuln/detail/CVE-2025-0239
mfsa2025-01 https://www.mozilla.org/en-US/security/advisories/mfsa2025-01
mfsa2025-01 https://www.mozilla.org/security/advisories/mfsa2025-01/
mfsa2025-02 https://www.mozilla.org/en-US/security/advisories/mfsa2025-02
mfsa2025-02 https://www.mozilla.org/security/advisories/mfsa2025-02/
mfsa2025-04 https://www.mozilla.org/en-US/security/advisories/mfsa2025-04
mfsa2025-04 https://www.mozilla.org/security/advisories/mfsa2025-04/
mfsa2025-05 https://www.mozilla.org/en-US/security/advisories/mfsa2025-05
mfsa2025-05 https://www.mozilla.org/security/advisories/mfsa2025-05/
RHSA-2025:0080 https://access.redhat.com/errata/RHSA-2025:0080
RHSA-2025:0132 https://access.redhat.com/errata/RHSA-2025:0132
RHSA-2025:0133 https://access.redhat.com/errata/RHSA-2025:0133
RHSA-2025:0134 https://access.redhat.com/errata/RHSA-2025:0134
RHSA-2025:0135 https://access.redhat.com/errata/RHSA-2025:0135
RHSA-2025:0136 https://access.redhat.com/errata/RHSA-2025:0136
RHSA-2025:0137 https://access.redhat.com/errata/RHSA-2025:0137
RHSA-2025:0138 https://access.redhat.com/errata/RHSA-2025:0138
RHSA-2025:0144 https://access.redhat.com/errata/RHSA-2025:0144
RHSA-2025:0147 https://access.redhat.com/errata/RHSA-2025:0147
RHSA-2025:0162 https://access.redhat.com/errata/RHSA-2025:0162
RHSA-2025:0165 https://access.redhat.com/errata/RHSA-2025:0165
RHSA-2025:0166 https://access.redhat.com/errata/RHSA-2025:0166
RHSA-2025:0167 https://access.redhat.com/errata/RHSA-2025:0167
RHSA-2025:0275 https://access.redhat.com/errata/RHSA-2025:0275
RHSA-2025:0281 https://access.redhat.com/errata/RHSA-2025:0281
RHSA-2025:0284 https://access.redhat.com/errata/RHSA-2025:0284
RHSA-2025:0286 https://access.redhat.com/errata/RHSA-2025:0286
RHSA-2025:0287 https://access.redhat.com/errata/RHSA-2025:0287
show_bug.cgi?id=1929156 https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
USN-7191-1 https://usn.ubuntu.com/7191-1/
No exploits are available.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2025-0239.json
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-01-08T16:33:42Z/ Found at https://bugzilla.mozilla.org/show_bug.cgi?id=1929156
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-01/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-01-08T16:33:42Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-01/
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-02/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-01-08T16:33:42Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-02/
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-04/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-01-08T16:33:42Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-04/
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N Found at https://www.mozilla.org/security/advisories/mfsa2025-05/
Attack Vector (AV) Attack Complexity (AC) Privileges Required (PR) User Interaction (UI) Scope (S) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

network

adjacent_network

local

physical

low

high

none

low

high

none

required

unchanged

changed

high

low

none

high

low

none

high

low

none
Vector: SSVCv2/E:N/A:N/T:P/P:M/B:A/M:M/D:T/2025-01-08T16:33:42Z/ Found at https://www.mozilla.org/security/advisories/mfsa2025-05/
Exploit Prediction Scoring System (EPSS)
Percentile 0.06776
EPSS Score 0.00029
Published At Sept. 19, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:24.333166+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2025/mfsa2025-05.yml 37.0.0