CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
83.7%
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. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.
OS | Version | Architecture | Package | Version | Filename |
---|---|---|---|---|---|
Debian | 999 | all | firefox | < 56.0-1 | firefox_56.0-1_all.deb |
Debian | 12 | all | firefox-esr | < 52.4.0esr-2 | firefox-esr_52.4.0esr-2_all.deb |
Debian | 11 | all | firefox-esr | < 52.4.0esr-2 | firefox-esr_52.4.0esr-2_all.deb |
Debian | 999 | all | firefox-esr | < 52.4.0esr-2 | firefox-esr_52.4.0esr-2_all.deb |
Debian | 13 | all | firefox-esr | < 52.4.0esr-2 | firefox-esr_52.4.0esr-2_all.deb |
Debian | 12 | all | nss | < 2:3.33-1 | nss_2:3.33-1_all.deb |
Debian | 11 | all | nss | < 2:3.33-1 | nss_2:3.33-1_all.deb |
Debian | 999 | all | nss | < 2:3.33-1 | nss_2:3.33-1_all.deb |
Debian | 13 | all | nss | < 2:3.33-1 | nss_2:3.33-1_all.deb |
Debian | 12 | all | thunderbird | < 1:52.4.0-1 | thunderbird_1:52.4.0-1_all.deb |
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:N/I:N/A:P
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
Percentile
83.7%