Juniper Junos OS flowd DoS via PIM sequence (before 24.2)
CVE-2025-52981 Published on July 11, 2025
Junos OS: SRX Series: Sequence of specific PIM packets causes a flowd crash
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on
SRX1600, SRX2300, SRX 4000 Series, and SRX5000 Series with SPC3
allows an unauthenticated, network-based attacker to cause a Denial-of-Service (DoS).
If a sequence of specific PIM packets is received, this will cause a flowd crash and restart.
This issue affects Junos OS:
* all versions before 21.2R3-S9,
* 21.4 versions before 21.4R3-S11,
* 22.2 versions before 22.2R3-S7,
* 22.4 versions before 22.4R3-S6,
* 23.2 versions before 23.2R2-S4,
* 23.4 versions before 23.4R2-S4,
* 24.2 versions before 24.2R2.
This is a similar, but different vulnerability than the issue reported as
CVE-2024-47503, published in JSA88133.
Vulnerability Analysis
CVE-2025-52981 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Improper Check for Unusual or Exceptional Conditions
The software does not check or incorrectly checks for unusual or exceptional conditions that are not expected to occur frequently during day to day operation of the software.
Products Associated with CVE-2025-52981
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Affected Versions
Juniper Networks Junos OS:- Before 21.2R3-S9 is affected.
- Version 21.4 and below 21.4R3-S11 is affected.
- Version 22.2 and below 22.2R3-S7 is affected.
- Version 22.4 and below 22.4R3-S6 is affected.
- Version 23.2 and below 23.2R2-S4 is affected.
- Version 23.4 and below 23.4R2-S4 is affected.
- Version 24.2 and below 24.2R2 is affected.
Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.