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CVE-2019-17558

Apache Solr 5.0.0 to Apache Solr 8.3.1 are vulnerable to a Remote Code Execution through the VelocityResponseWriter. A Velocity template can be provided through Velocity templates in a configset `velocity/` directory or as a parameter. A user defined configset could contain rende…

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Apache Solr 5.0.0 to Apache Solr 8.3.1 are vulnerable to a Remote Code Execution through the VelocityResponseWriter. A Velocity template can be provided through Velocity templates in a configset `velocity/` directory or as a parameter. A user defined configset could contain renderable, potentially malicious, templates. Parameter provided templates are disabled by default, but can be enabled by setting `params.resource.loader.enabled` by defining a response writer with that setting set to `true`. Defining a response writer requires configuration API access. Solr 8.4 removed the params resource loader entirely, and only enables the configset-provided template rendering when the configset is `trusted` (has been uploaded by an authenticated user).
CVSS 7.5 (HIGH) KEV: KNOWN CATALOG

Attention and evidence

HYPE SCORE
1.1/10
REALITY · THREAT PRIORITY
8.6/10
General review priority; not probability

Evidence confidence: Exploitation recorded

Why this priority?
  • Recorded exploitation baseline: +7.00
  • Technical severity: CVSS 7.5: +1.12
  • Fresh EPSS: 98.57%: +0.49

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

Sources: 3 documents and public datasets.

Hype components

Headline sample (25%)
30/100
Press, 30 days (60%)
5/100
Grounded branding (15%)
0/100
HYPE TOTAL10/100

Sources and documents

www.theregister.com - Articles
Press · 02 Nov 2026, 22:55 · Max-severity bug in widely used OT programming tool exploited to deliver Linux malware
Help Net Security
Press · 23 Feb 2023, 08:00 · Researchers find hidden vulnerabilities in hundreds of Docker containers - Help Net Security
Qualys
Press · 22 Feb 2022, 08:00 · Managing CISA Known Exploited Vulnerabilities with Qualys VMDR - Qualys

Score evolution

● Hype   ● Reality

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

024681002 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 0.0Reality 8.602 Nov 2026 · OBSERVED EXPLOITATION + LOWER RECENT ATTENTIONHype 1.1Reality 8.6Nov 2Nov 2

━ Hype Score (Perceived)  ━ Reality threat priority. Definition changes are not new attacks.

Public exploit evidence

2

Public exploit entries / repo candidates

See 2 repos with metrics
RepositoryStarsForksLanguageUpdated
zhzyker/exphub4,2941,078Python04 Apr 2021, 09:13
thelostworldFree/CVE-2019-17558_Solr_Vul_Tool15—10 Jan 2020, 10:58
Public exploit evidence
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 7.5; EPSS 98.6%
Attention, last 30 days
1 distinct story titles; 1 press documents; 1 publisher domains.
Technical potential
network access, low 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 13:58:06.921295+00:00 · EPSS snapshot: 2026-11-05T12:03:04Z

Source event timeline
Published
30 Dec 2019, 16:36
Added to the CISA KEV catalog
03 Nov 2021, 00:00
First press mention
22 Feb 2022, 08:00
Latest press mention
02 Nov 2026, 22:55
Score calculated
05 Nov 2026, 13:58
PoCs on GitHub
2 repositories