Executive Summary
Informations | |||
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Name | CVE-2021-25217 | First vendor Publication | 2021-05-26 |
Vendor | Cve | Last vendor Modification | 2023-11-07 |
Security-Database Scoring CVSS v3
Cvss vector : CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H | |||
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Overall CVSS Score | 7.4 | ||
Base Score | 7.4 | Environmental Score | 7.4 |
impact SubScore | 4 | Temporal Score | 7.4 |
Exploitabality Sub Score | 2.8 | ||
Attack Vector | Adjacent | Attack Complexity | Low |
Privileges Required | None | User Interaction | None |
Scope | Changed | Confidentiality Impact | None |
Integrity Impact | None | Availability Impact | High |
Calculate full CVSS 3.0 Vectors scores |
Security-Database Scoring CVSS v2
Cvss vector : (AV:A/AC:L/Au:N/C:N/I:N/A:P) | |||
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Cvss Base Score | 3.3 | Attack Range | Adjacent network |
Cvss Impact Score | 2.9 | Attack Complexity | Low |
Cvss Expoit Score | 6.5 | Authentication | None Required |
Calculate full CVSS 2.0 Vectors scores |
Detail
In ISC DHCP 4.1-ESV-R1 -> 4.1-ESV-R16, ISC DHCP 4.4.0 -> 4.4.2 (Other branches of ISC DHCP (i.e., releases in the 4.0.x series or lower and releases in the 4.3.x series) are beyond their End-of-Life (EOL) and no longer supported by ISC. From inspection it is clear that the defect is also present in releases from those series, but they have not been officially tested for the vulnerability), The outcome of encountering the defect while reading a lease that will trigger it varies, according to: the component being affected (i.e., dhclient or dhcpd) whether the package was built as a 32-bit or 64-bit binary whether the compiler flag -fstack-protection-strong was used when compiling In dhclient, ISC has not successfully reproduced the error on a 64-bit system. However, on a 32-bit system it is possible to cause dhclient to crash when reading an improper lease, which could cause network connectivity problems for an affected system due to the absence of a running DHCP client process. In dhcpd, when run in DHCPv4 or DHCPv6 mode: if the dhcpd server binary was built for a 32-bit architecture AND the -fstack-protection-strong flag was specified to the compiler, dhcpd may exit while parsing a lease file containing an objectionable lease, resulting in lack of service to clients. Additionally, the offending lease and the lease immediately following it in the lease database may be improperly deleted. if the dhcpd server binary was built for a 64-bit architecture OR if the -fstack-protection-strong compiler flag was NOT specified, the crash will not occur, but it is possible for the offending lease and the lease which immediately followed it to be improperly deleted. |
Original Source
Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-25217 |
CWE : Common Weakness Enumeration
% | Id | Name |
---|---|---|
100 % | CWE-119 | Failure to Constrain Operations within the Bounds of a Memory Buffer |
CPE : Common Platform Enumeration
Sources (Detail)
Alert History
Date | Informations |
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2024-08-02 13:23:11 |
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2024-08-02 01:24:52 |
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2024-02-02 02:23:30 |
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2024-02-01 12:23:13 |
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2023-11-07 21:34:52 |
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2023-09-05 13:17:49 |
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2023-09-05 01:22:46 |
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2023-09-02 13:16:27 |
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2023-09-02 01:23:06 |
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2023-08-12 13:22:28 |
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2023-08-12 01:22:19 |
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2023-08-11 13:14:52 |
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2023-08-11 01:23:01 |
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2023-08-06 13:12:54 |
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2023-08-06 01:22:03 |
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2023-08-04 13:13:17 |
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2023-08-04 01:22:24 |
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2023-07-14 13:13:18 |
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2023-07-14 01:22:13 |
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2023-05-03 17:27:44 |
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2023-03-29 02:15:35 |
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2023-03-28 12:22:27 |
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2022-11-15 01:55:40 |
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2022-10-29 09:27:59 |
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2022-10-14 01:57:41 |
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2022-10-11 13:05:30 |
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2022-10-11 01:22:00 |
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2022-09-13 17:27:23 |
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2022-05-14 00:27:33 |
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2022-03-25 12:52:45 |
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2022-03-10 21:23:23 |
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2021-06-09 21:23:18 |
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2021-06-05 09:22:46 |
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2021-06-04 01:39:18 |
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2021-06-04 01:38:48 |
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2021-06-03 21:23:10 |
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2021-06-03 12:39:08 |
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2021-06-02 17:22:47 |
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2021-05-27 05:22:46 |
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