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Page generated: 08 Nov 2026, 12:12 UTC
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CVE-2021-30116

Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker …

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Kaseya VSA before 9.5.7 allows credential disclosure, as exploited in the wild in July 2021. By default Kaseya VSA on premise offers a download page where the clients for the installation can be downloaded. The default URL for this page is https://x.x.x.x/dl.asp When an attacker download a client for Windows and installs it, the file KaseyaD.ini is generated (C:\Program Files (x86)\Kaseya\XXXXXXXXXX\KaseyaD.ini) which contains an Agent_Guid and AgentPassword This Agent_Guid and AgentPassword can be used to log in on dl.asp (https://x.x.x.x/dl.asp?un=840997037507813&pw=113cc622839a4077a84837485ced6b93e440bf66d44057713cb2f95e503a06d9) This request authenticates the client and returns a sessionId cookie that can be used in subsequent attacks to bypass authentication. Security issues discovered --- * Unauthenticated download page leaks credentials * Credentials of agent software can be used to obtain a sessionId (cookie) that can be used for services not intended for use by agents * dl.asp accepts credentials via a GET request * Access to KaseyaD.ini gives an attacker access to sufficient information to penetrate the Kaseya installation and its clients. Impact --- Via the page /dl.asp enough information can be obtained to give an attacker a sessionId that can be used to execute further (semi-authenticated) attacks against the system.
CVSS 10.0 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.9/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 10: +1.50
  • Fresh EPSS: 85.73%: +0.43

General review priority, not probability, victim count or asset-specific risk. A range covers missing CVSS/EPSS inputs within the current evidence state.

Sources: 12 documents and public datasets.

Hype components

Headline sample (25%)
0/100
Press, 30 days (60%)
0/100
Grounded branding (15%)
0/100
HYPE TOTAL0/100

Sources and documents

Cybernews
Press · 19 Jul 2021, 07:00 · An in-depth analysis of the Kaseya ransomware attack: here’s what you need to know - Cybernews
The Hacker News
Press · 12 Jul 2021, 07:00 · Kaseya Releases Patches for Flaws Exploited in Widespread Ransomware Attack - The Hacker News
BleepingComputer
Press · 11 Jul 2021, 07:00 · Kaseya patches VSA vulnerabilities used in REvil ransomware attack - BleepingComputer
TechTarget
Press · 08 Jul 2021, 07:00 · Dutch researchers shed new light on Kaseya vulnerabilities - TechTarget
Qualys
Press · 08 Jul 2021, 07:00 · Kaseya REvil Ransomware Attack (CVE-2021-30116) – Automatically Discover and Prioritize Using Qualys VMDR - Qualys
See all 12 source documents
Kroll
Press · 08 Jul 2021, 07:00 · Addressing the Ransomware Attack Against Kaseya VSA Customers - Kroll
Qualys
Press · 08 Jul 2021, 07:00 · REvil Ransomware Attack Analysis | REvil Group Insights - Qualys
TechTarget
Press · 06 Jul 2021, 07:00 · Kaseya ransomware attacks: What we know so far - TechTarget
The Hacker News
Press · 06 Jul 2021, 07:00 · Kaseya Rules Out Supply-Chain Attack; Says VSA 0-Day Hit Its Customers Directly - The Hacker News
TechTarget
Press · 06 Jul 2021, 07:00 · Kaseya ransomware attacks: What we know so far - TechTarget
The Hacker News
Press · 05 Jul 2021, 07:00 · REvil Used 0-Day in Kaseya Ransomware Attack, Demands $70 Million Ransom - The Hacker News
Cisco Talos Blog
Press · 02 Jul 2021, 07:00 · REvil ransomware actors attack Kaseya in supply chain attack - Cisco Talos Blog

Score evolution

● Hype   ● Reality

Earlier evidence-support scores are retained in history; this chart shows only the current priority definition.

First record: hype 0.0 · reality 8.9 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

0

Public exploit entries / repo candidates

Evidence context and dated references

Reality is general threat/review priority, combining observed exploitation, CVSS severity and fresh EPSS. Evidence confidence is separate. This is not calibrated risk, a victim count or an asset-specific assessment. A range reflects missing numeric inputs.

Evidence in context

Confidence in exploitation evidence
Exploitation recorded
Priority basis
Recorded exploitation; CVSS 10; EPSS 85.7%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:26.907878+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
02 Jul 2021, 07:00
Published
09 Jul 2021, 00:00
Latest press mention
19 Jul 2021, 07:00
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Score calculated
05 Nov 2026, 13:58
Source: CVE List V5 · CISA KEV · FIRST EPSS · GitHub · RSSVulnRadar