CVE-2021-0295 Detail

CVE-2021-0295

Score / Severity

6.1

Medium

EPSS

0.09%V3

Vector

Adjacent

Published

2021-07-15
20h01 +00:00

Modified

2024-09-17
03h59 +00:00

Official links

CVE.org

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CVE Descriptions

Junos OS: QFX10K Series: Denial of Service (DoS) upon receipt of DVMRP packets received on multi-homing ESI in VXLAN.

A vulnerability in the Distance Vector Multicast Routing Protocol (DVMRP) of Juniper Networks Junos OS on the QFX10K Series switches allows an attacker to trigger a packet forwarding loop, leading to a partial Denial of Service (DoS). The issue is caused by DVMRP packets looping on a multi-homed Ethernet Segment Identifier (ESI) when VXLAN is configured. DVMRP packets received on a multi-homed ESI are sent to the peer, and then incorrectly forwarded out the same ESI, violating the split horizon rule. This issue only affects QFX10K Series switches, including the QFX10002, QFX10008, and QFX10016. Other products and platforms are unaffected by this vulnerability. This issue affects Juniper Networks Junos OS on QFX10K Series: 17.3 versions prior to 17.3R3-S12; 17.4 versions prior to 17.4R3-S5; 18.1 versions prior to 18.1R3-S13; 18.2 version 18.2R1 and later versions; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R2-S9, 18.4R3-S8; 19.1 versions prior to 19.1R3-S5; 19.2 versions prior to 19.2R1-S7, 19.2R3-S2; 19.3 versions prior to 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R2-S2, 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2.

CVE Solutions

The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S12, 17.4R3-S5, 18.1R3-S13, 18.3R3-S5, 18.4R2-S9, 18.4R3-S8, 19.1R3-S5, 19.2R1-S7, 19.2R3-S2, 19.3R3-S2, 19.4R3-S3, 20.1R2-S2, 20.1R3, 20.2R3, 20.3R3, 20.4R2, 21.1R1, and all subsequent releases.

CVE Informations

Related Weaknesses

CWE-ID	Weakness Name	Source
CWE-697	Incorrect Comparison The product compares two entities in a security-relevant context, but the comparison is incorrect, which may lead to resultant weaknesses.

Metrics

Metrics	Score	Severity	CVSS Vector	Source
V3.1	6.1	MEDIUM	CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L More informations Base: Exploitabilty Metrics The Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. Adjacent The vulnerable component is bound to the network stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared physical (e.g., Bluetooth or IEEE 802.11) or logical (e.g., local IP subnet) network, or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN to an administrative network zone). Attack Complexity This metric describes the conditions beyond the attacker’s control that must exist in order to exploit the vulnerability. Low Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success when attacking the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. None The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. User Interaction This metric captures the requirement for a human user, other than the attacker, to participate in the successful compromise of the vulnerable component. None The vulnerable system can be exploited without interaction from any user. Base: Scope Metrics The Scope metric captures whether a vulnerability in one vulnerable component impacts resources in components beyond its security scope. Scope Formally, a security authority is a mechanism (e.g., an application, an operating system, firmware, a sandbox environment) that defines and enforces access control in terms of how certain subjects/actors (e.g., human users, processes) can access certain restricted objects/resources (e.g., files, CPU, memory) in a controlled manner. All the subjects and objects under the jurisdiction of a single security authority are considered to be under one security scope. If a vulnerability in a vulnerable component can affect a component which is in a different security scope than the vulnerable component, a Scope change occurs. Intuitively, whenever the impact of a vulnerability breaches a security/trust boundary and impacts components outside the security scope in which vulnerable component resides, a Scope change occurs. Changed An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities. Base: Impact Metrics The Impact metrics capture the effects of a successfully exploited vulnerability on the component that suffers the worst outcome that is most directly and predictably associated with the attack. Analysts should constrain impacts to a reasonable, final outcome which they are confident an attacker is able to achieve. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. None There is no loss of confidentiality within the impacted component. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. Low Modification of data is possible, but the attacker does not have control over the consequence of a modification, or the amount of modification is limited. The data modification does not have a direct, serious impact on the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. Low Performance is reduced or there are interruptions in resource availability. Even if repeated exploitation of the vulnerability is possible, the attacker does not have the ability to completely deny service to legitimate users. The resources in the impacted component are either partially available all of the time, or fully available only some of the time, but overall there is no direct, serious consequence to the impacted component. Temporal Metrics The Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence in the description of a vulnerability. Environmental Metrics These metrics enable the analyst to customize the CVSS score depending on the importance of the affected IT asset to a user’s organization, measured in terms of Confidentiality, Integrity, and Availability.
V2	2.9		AV:A/AC:M/Au:N/C:N/I:N/A:P	[email protected]

EPSS

EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.

EPSS Score

The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.

EPSS Percentile

The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.

EPSS First.org

Products Mentioned

Configuraton 0

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)
Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)

Juniper>>Junos >> Version 17.3

Juniper>>Junos >> Version 17.3 (Open CPE detail)