CVE-2021-20090
Scores
EPSS
Percentile: 94.4%
CVSS
CVSS Score: 9.8/10
All CVSS Scores
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Privileges Required
None (N)
Describes the level of privileges an attacker must possess
User Interaction
None (N)
Captures the requirement for a human user participation
Scope
Unchanged (U)
Determines if a successful attack impacts components beyond the vulnerable component
Confidentiality Impact
High (H)
Measures the impact to the confidentiality of information
Integrity Impact
High (H)
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
High (H)
Measures the impact to the availability of the impacted component
Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P
Vector Breakdown
CVSS (Common Vulnerability Scoring System) vector provides detailed metrics about vulnerability characteristics
CVSS
Attack Vector
Network (N)
Describes how the vulnerability is exploited
Attack Complexity
Low (L)
Describes the conditions beyond the attacker's control
Authentication
None (N)
Describes the level of privileges an attacker must possess
Confidentiality Impact
Partial
Measures the impact to the confidentiality of information
Integrity Impact
Partial
Measures the impact to integrity of a successfully exploited vulnerability
Availability Impact
Partial
Measures the impact to the availability of the impacted component
Description
A path traversal vulnerability in the web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 could allow unauthenticated remote attackers to bypass authentication.
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Sources
CWEs
Related Vulnerabilities
Exploits
Exploit ID: CVE-2021-20090
Source: cisa
URL: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Recommendations
Source: nvd
The CERT/CC recommends updating your router to the latest available firmware version. It is also recommended to disable the remote (WAN-side) administration services on any SoHo router and also disable the web interface on the WAN.
Vulnerable Software (2)
Type: Configuration
Vendor: buffalo
Product: wsr-2533dhp3-bk_firmware
Operating System: * * *
{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:*",
"versionEndIncluding": "1.24",
"vulnerabl...{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:buffalo:wsr-2533dhp3-bk_firmware:*:*:*:*:*:*:*:*",
"versionEndIncluding": "1.24",
"vulnerable": true
}
],
"operator": "OR"
},
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:h:buffalo:wsr-2533dhp3-bk:-:*:*:*:*:*:*:*"
}
],
"operator": "OR"
}
],
"operator": "AND"
}Source: nvd
Type: Configuration
Vendor: buffalo
Product: wsr-2533dhpl2-bk_firmware
Operating System: * * *
{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*",
"versionEndIncluding": "1.02",
"vulnerab...{
"children": [
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*",
"versionEndIncluding": "1.02",
"vulnerable": true
}
],
"operator": "OR"
},
{
"cpe_match": [
{
"cpe23uri": "cpe:2.3:h:buffalo:wsr-2533dhpl2-bk:-:*:*:*:*:*:*:*"
}
],
"operator": "OR"
}
],
"operator": "AND"
}Source: nvd