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CVE-2021-35211

Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File …

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Microsoft discovered a remote code execution (RCE) vulnerability in the SolarWinds Serv-U product utilizing a Remote Memory Escape Vulnerability. If exploited, a threat actor may be able to gain privileged access to the machine hosting Serv-U Only. SolarWinds Serv-U Managed File Transfer and Serv-U Secure FTP for Windows before 15.2.3 HF2 are affected by this vulnerability.
CVSS 9.0 (CRITICAL) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
0.0/10
REALITY · THREAT PRIORITY
8.8/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 9: +1.35
  • Fresh EPSS: 91.16%: +0.46

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

Sources: 9 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

The Hacker News
Press · 25 Feb 2026, 08:00 · SolarWinds Patches 4 Critical Serv-U 15.5 Flaws Allowing Root Code Execution - The Hacker News
BleepingComputer
Press · 24 Feb 2026, 08:00 · Critical SolarWinds Serv-U flaws offer root access to servers - BleepingComputer
Help Net Security
Press · 20 Jan 2022, 08:00 · New SolarWinds Serv-U vulnerability targeted in Log4j-related attacks - Help Net Security
The Register
Press · 10 Nov 2021, 08:00 · Stor-a-File hit by ransomware through SolarWinds Serv-U - The Register
The Hacker News
Press · 04 Sep 2021, 07:00 · Microsoft Says Chinese Hackers Were Behind SolarWinds Serv-U SSH 0-Day Attack - The Hacker News
See all 9 source documents
Microsoft
Press · 02 Sep 2021, 07:00 · A deep-dive into the SolarWinds Serv-U SSH vulnerability - Microsoft
SOC Prime
Press · 21 Jul 2021, 07:00 · Detect HiveNightmare (CVE-2021-36934) Exploitation Attempts - SOC Prime
Help Net Security
Press · 13 Jul 2021, 07:00 · SolarWinds patches zero-day exploited in the wild (CVE-2021-35211) - Help Net Security
Microsoft
Press · 13 Jul 2021, 07:00 · Microsoft discovers threat actor targeting SolarWinds Serv-U software with 0-day exploit - Microsoft

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 8.8 (2026-11-02 15:12). The curve appears once the score changes.

Public exploit evidence

1

Public exploit entries / repo candidates

See 1 repos with metrics
RepositoryStarsForksLanguageUpdated
NattiSamson/Serv-U-CVE-2021-35211126Python30 Sep 2021, 01:46
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 9; EPSS 91.2%
Attention, last 30 days
0 distinct story titles; 0 press documents; 0 publisher domains.
Technical potential
network access, no prior privileges, no user interaction, additional attack conditions.
Observed activity
Exploitation recorded in CISA KEV.
Known scale
Not quantified.
Evidence confidence basis
Trusted exploitation confirmation

Score evaluated: 2026-11-05 13:58:27.921902+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
First press mention
13 Jul 2021, 07:00
Published
14 Jul 2021, 20:55
Added to the CISA KEV catalog
03 Nov 2021, 00:00
Latest press mention
25 Feb 2026, 08:00
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
1 repositories