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Vulnerability details: VCID-wqhe-hmdh-p7eq
Vulnerability ID VCID-wqhe-hmdh-p7eq
Aliases CVE-2017-7805
Summary During TLS 1.2 exchanges, handshake hashes are generated which point to a message buffer. This saved data is used for later messages but in some cases, the handshake transcript can exceed the space available in the current buffer, causing the allocation of a new buffer. This leaves a pointer pointing to the old, freed buffer, resulting in a use-after-free when handshake hashes are then calculated afterwards. This can result in a potentially exploitable crash.
Status Published
Exploitability 0.5
Weighted Severity 9.0
Risk 4.5
Affected and Fixed Packages Package Details
Weaknesses (1)
CWE-416 Use After Free
System Score Found at
cvssv3 7.5 https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-7805.json
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
epss 0.04831 https://api.first.org/data/v1/epss?cve=CVE-2017-7805
cvssv2 7.1 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv3 7.5 https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
cvssv2 5.0 https://nvd.nist.gov/vuln/detail/CVE-2017-7805
cvssv3 7.5 https://nvd.nist.gov/vuln/detail/CVE-2017-7805
archlinux Critical https://security.archlinux.org/AVG-441
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2017-21
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2017-22
generic_textual critical https://www.mozilla.org/en-US/security/advisories/mfsa2017-23
Reference id Reference type URL
https://access.redhat.com/errata/RHSA-2017:2832
https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-7805.json
https://api.first.org/data/v1/epss?cve=CVE-2017-7805
https://bugzilla.mozilla.org/show_bug.cgi?id=1377618
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7793
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7805
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7810
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7814
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7818
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7819
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7823
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7824
https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
https://lists.debian.org/debian-lts-announce/2017/11/msg00000.html
https://security.gentoo.org/glsa/201803-14
https://www.debian.org/security/2017/dsa-3987
https://www.debian.org/security/2017/dsa-3998
https://www.debian.org/security/2017/dsa-4014
https://www.mozilla.org/security/advisories/mfsa2017-21/
https://www.mozilla.org/security/advisories/mfsa2017-22/
https://www.mozilla.org/security/advisories/mfsa2017-23/
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securityfocus.com/bid/101059
http://www.securitytracker.com/id/1039465
1471171 https://bugzilla.redhat.com/show_bug.cgi?id=1471171
ASA-201710-19 https://security.archlinux.org/ASA-201710-19
AVG-441 https://security.archlinux.org/AVG-441
cpe:2.3:a:mozilla:firefox:52.4.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:52.4.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:firefox:56.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:firefox:56.0:*:*:*:*:*:*:*
cpe:2.3:a:mozilla:thunderbird:52.4.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:a:mozilla:thunderbird:52.4.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:7.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:* https://nvd.nist.gov/vuln/search/results?adv_search=true&isCpeNameSearch=true&query=cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
CVE-2017-7805 https://nvd.nist.gov/vuln/detail/CVE-2017-7805
mfsa2017-21 https://www.mozilla.org/en-US/security/advisories/mfsa2017-21
mfsa2017-22 https://www.mozilla.org/en-US/security/advisories/mfsa2017-22
mfsa2017-23 https://www.mozilla.org/en-US/security/advisories/mfsa2017-23
USN-3431-1 https://usn.ubuntu.com/3431-1/
USN-3435-1 https://usn.ubuntu.com/3435-1/
USN-3436-1 https://usn.ubuntu.com/3436-1/
No exploits are available.
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H Found at https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2017-7805.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: AV:N/AC:H/Au:S/C:C/I:C/A:C Found at https://ftp.suse.com/pub/projects/security/yaml/suse-cvss-scores.yaml
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H 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: AV:N/AC:L/Au:N/C:N/I:N/A:P Found at https://nvd.nist.gov/vuln/detail/CVE-2017-7805
Exploitability (E) Access Vector (AV) Access Complexity (AC) Authentication (Au) Confidentiality Impact (C) Integrity Impact (I) Availability Impact (A)

high

functional

unproven

proof_of_concept

not_defined

local

adjacent_network

network

high

medium

low

multiple

single

none

none

partial

complete

none

partial

complete

none

partial

complete
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Found at https://nvd.nist.gov/vuln/detail/CVE-2017-7805
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
Exploit Prediction Scoring System (EPSS)
Percentile 0.89109
EPSS Score 0.04831
Published At July 30, 2025, 12:55 p.m.
Date Actor Action Source VulnerableCode Version
2025-07-31T08:09:15.066449+00:00 Mozilla Importer Import https://github.com/mozilla/foundation-security-advisories/blob/master/announce/2017/mfsa2017-23.yml 37.0.0