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CVE-2020-2501

25
FAUCET Score

CVE-2020-2501 is a critical stack-based buffer overflow vulnerability impacting QNAP NAS devices running Surveillance Station. This flaw allows unauthenticated attackers to execute arbitrary code remotely with low attack complexity, leading to complete compromise of confidentiality, integrity, and availability. While not currently listed in CISA's KEV catalog, an exploit has been publicly released, and the vulnerability has garnered some community discussion and media coverage. QNAP has released patches in Surveillance Station versions 5.1.5.4.3 and 5.1.5.3.3, depending on the device's architecture.

Impacted Technologies

VendorProductVersion(s)CPE
< 5.1.5.3.3CPE matchmatch criteria
cpe:2.3:a:qnap:surveillance_station:*:*:*:*:*:*:*:*
>= 5.1.5.4.0, < 5.1.5.4.3CPE matchmatch criteria
cpe:2.3:a:qnap:surveillance_station:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

9.8CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.94%
Probability of exploitation in next 30 days
EPSS Percentile
85.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0294 is in the 77th percentile among its peer group of 36,897 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

qnap.com / en/security-advisory/qsa-21-07
Vendor Advisory