CVE-2019-20808 Vulnerability Analysis & Exploit Details

Status: Modified - Last modified: 07 Nov 2023, 03:09 UTC Published: 31 Dec 2020, 01:15 UTC

CVE-2019-20808
Vulnerability Scoring

6.5
/10

Attack Complexity Details

  • Attack Complexity: Low Impact
  • Attack Vector: LOCAL
  • Privileges Required: Low Impact
  • Scope: CHANGED
  • User Interaction: NONE

CIA Impact Definition

  • Confidentiality:
  • Integrity:
  • Availability: HIGH IMPACT

CVE-2019-20808 Vulnerability Summary

In QEMU 4.1.0, an out-of-bounds read flaw was found in the ATI VGA implementation. It occurs in the ati_cursor_define() routine while handling MMIO write operations through the ati_mm_write() callback. A malicious guest could abuse this flaw to crash the QEMU process, resulting in a denial of service.

Access Complexity Graph

Above is the Access Complexity Graph for CVE-2019-20808. It helps visualize the difficulty level and privilege requirements needed to exploit this vulnerability, providing a quick assessment of its exploitation feasibility.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2019-20808, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

Impact Analysis

Below is the Impact Analysis for CVE-2019-20808, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

Exploit Prediction Scoring System (EPSS)

The EPSS score estimates the probability that this vulnerability will be exploited in the near future.

EPSS Score: 0.044% (probability of exploit)

EPSS Percentile: 15.12% (lower percentile = lower relative risk)
This vulnerability is less risky than approximately 84.88% of others.

CVE-2019-20808 Detailed Information and External References

References

CWE

CWE-125

CAPEC

  • Overread Buffers CAPEC-540 An adversary attacks a target by providing input that causes an application to read beyond the boundary of a defined buffer. This typically occurs when a value influencing where to start or stop reading is set to reflect positions outside of the valid memory location of the buffer. This type of attack may result in exposure of sensitive information, a system crash, or arbitrary code execution.

Vulnerable Configurations

  • cpe:2.3:a:qemu:qemu:4.1.0:-:*:*:*:*:*:*
    cpe:2.3:a:qemu:qemu:4.1.0:-:*:*:*:*:*:*

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H

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