CVE-2025-61770VulnerabilityPublished 18 Nov 2025Updated 31 Aug 2026

Red Hat Security Advisory: pcs security update

Affects Red HatSource GCVE Database

Mentioned vulnerabilities

Not known to be exploited : upgrade to 0.9.170 soon.

Data as of 26 Oct 2026, 06:26 UTC

Severity

High

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.9% chance of exploitation in 30 days – higher than 60% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 0.9.170

Exploitation evidence

Disclosed: evidence found.
CVE published 18 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 2026-10-26.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Red Hat to 0.9.170.

Affected software

Product	Affected	Fixed in
Red Hat Product Security Red Hat	Affected >=0.9.169 <0.9.170	Fixed in 0.9.170

AI-suggested

Red Hat has released updated pcs packages (version 0.9.169-3.el7_9.5) for Red Hat Enterprise Linux 7 Extended Lifecycle Support that fix these vulnerabilities. Users should apply these official updates as described in the Red Hat advisory (https://access.redhat.com/articles/11258) to remediate the issues. No additional mitigation steps are indicated by the vendor.

Description

Multiple denial-of-service vulnerabilities have been identified in the pcs packages used for configuring Pacemaker and Corosync utilities on Red Hat Enterprise Linux 7 Extended Lifecycle Support. These issues stem from unbounded buffering and reading in the Rack multipart parser and Rack::Request form parsing, which can lead to memory exhaustion. The vulnerabilities are rated as important by Red Hat and affect specific versions of the pcs package. Updates addressing these issues are available.

Impact

Exploitation of these vulnerabilities can cause denial-of-service conditions by exhausting system memory due to unbounded buffering and reading in multipart parsing components. This could disrupt the availability of the pcs command-line configuration system and related cluster management utilities.

Summary

The pcs packages for Red Hat Enterprise Linux 7 Extended Lifecycle Support contain vulnerabilities related to unbounded multipart preamble buffering and multipart parser buffering in the Rack component, as well as unbounded reads in the rubygem-rack Rack::Request form parsing. These flaws (CVE-2025-61770, CVE-2025-61771, CVE-2025-61919) enable denial-of-service attacks through memory exhaustion. Red Hat has issued security updates for pcs version 0.9.169 to address these issues.

CWE-400Uncontrolled Resource Consumption (opens in a new tab)
Class weaknessLikelihood of exploit: High
The product does not properly control the allocation and maintenance of a limited resource.
MITRE discourages mapping vulnerabilities to this broad entry; the root cause is usually a more specific weakness.
Architecture and Design
Design throttling mechanisms into the system architecture. The best protection is to limit the amount of resources that an unauthorized user can cause to be expended. A strong authentication and access control model will help prevent such attacks from occurring in the first place.
Architecture and Design
Mitigation of resource exhaustion attacks requires that the target system either: recognizes the attack and denies that user further access for a given amount of time, or; uniformly throttles all requests in order to make it more difficult to consume resources more quickly than they can again be freed.
Architecture and Design
Ensure that protocols have specific limits of scale placed on them.
OWASP Cheat Sheets
File Upload (opens in a new tab)
OWASP ASVS 4.0.3
V12.1.1 (opens in a new tab)
Attack patterns
XML Ping of the Death (opens in a new tab)
Regular Expression Exponential Blowup (opens in a new tab)
Sustained Client Engagement (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).
CWE-1284Improper Validation of Specified Quantity in Input (opens in a new tab)
Base weakness
The product receives input that is expected to specify a quantity (such as size or length), but it does not validate or incorrectly validates that the quantity has the required properties.
Implementation · Input Validation
Assume all input is malicious. Use an "accept known good" input validation strategy, i.e., use a list of acceptable inputs that strictly conform to specifications. Reject any input that does not strictly conform to specifications, or transform it into something that does.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 12 Sep 2026, 21:46 UTC

WeaknessesCWE-400, CWE-1284

Technical details

References

Community reviews

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