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NVD / CVE Program· CNA juniper

CVE-2024-39517: Junos OS and Junos OS Evolved: Upon processing specific L2 traffic, rpd can hang in devices with EVPN/VXLAN configured

HighCVSS 7.1 · v4.0—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 28/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Juniper Networks Junos OS 21.2R3-S8, 21.4R3-S7, 22.1R3-S5; Juniper Networks Junos OS Evolved 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.1R3-S5-EVO.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Juniper Networks Junos OS 21.2R3-S8, 21.4R3-S7, 22.1R3-S5; Juniper Networks Junos OS Evolved 21.2R3-S8-EVO, 21.4R3-S7-EVO, 22.1R3-S5-EVO or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

An Improper Check for Unusual or Exceptional Conditions vulnerability in the Layer 2 Address Learning Daemon (l2ald) on Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated, adjacent attacker to cause Denial of Service (DoS). In an EVPN/VXLAN scenario, when a high amount specific Layer 2 packets are processed by the device, it can cause the Routing Protocol Daemon (rpd) to utilize all CPU resources which causes the device to hang. A manual restart of the rpd is required to restore services. This issue affects both IPv4 and IPv6 implementations. This issue affects Junos OS: All versions earlier than 21.4R3-S7; 22.1 versions earlier than 22.1R3-S5; 22.2 versions earlier than 22.2R3-S3; 22.3 versions earlier than 22.3R3-S3; 22.4 versions earlier than 22.4R3-S2; 23.2 versions earlier than 23.2R2; 23.4 versions earlier than 23.4R1-S1. Junos OS Evolved: All versions earlier than 21.4R3-S7-EVO; 22.1-EVO versions earlier than 22.1R3-S5-EVO; 22.2-EVO versions earlier than 22.2R3-S3-EVO; 22.3-EVO versions earlier than 22.3R3-S3-EVO; 22.4-EVO versions earlier than 22.4R3-S2-EVO; 23.2-EVO versions earlier than 23.2R2-EVO; 23.4-EVO versions earlier than 23.4R1-S1-EVO, 23.4R2-EVO.

Published
Jul 10, 2024
Updated
Jun 17, 2026
EPSS
0.2% · 16th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · juniper
6.5
NVD has not scored this yet; the score shown is the CNA’s.

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-39517

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
juniperjunos
juniperjunos os evolved

Versions reported by the vendor

Affected version ranges reported by the assigning authority (juniper). Independent of NVD's CPE analysis and usually ahead of it.

  • Juniper Networks Junos OS

    • before 21.2R3-S8affected · semver
    • 21.4 and later · before 21.4R3-S7affected · semver
    • 22.1 and later · before 22.1R3-S5affected · semver
    • 22.2 and later · before 22.2R3-S3affected · semver
    • 22.3 and later · before 22.3R3-S3affected · semver
    • 22.4 and later · before 22.4R3-S2affected · semver
    • 23.2 and later · before 23.2R2affected · semver
    • 23.4 and later · before 23.4R1-S1affected · semver

  • Juniper Networks Junos OS Evolved

    • before 21.2R3-S8-EVOaffected · semver
    • 21.4-EVO and later · before 21.4R3-S7-EVOaffected · semver
    • 22.1-EVO and later · before 22.1R3-S5-EVOaffected · semver
    • 22.2-EVO and later · before 22.2R3-S3-EVOaffected · semver
    • 22.3-EVO and later · before 22.3R3-S3-EVOaffected · semver
    • 22.4-EVO and later · before 22.4R3-S2-EVOaffected · semver
    • 23.2-EVO and later · before 23.2R2-EVOaffected · semver
    • 23.4-EVO and later · before 23.4R1-S1-EVO, 23.4R2-EVOaffected · semver
Affected versions · NVD (16)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • juniper junosbefore 21.4
  • juniper junos21.4
  • juniper junos22.1
  • juniper junos22.2
  • juniper junos22.3
  • juniper junos22.4
  • juniper junos23.2
  • juniper junos23.4
  • juniper junos os evolvedbefore 21.4
  • juniper junos os evolved21.4
  • juniper junos os evolved22.1
  • juniper junos os evolved22.2
  • juniper junos os evolved22.3
  • juniper junos os evolved22.4
  • juniper junos os evolved23.2
  • juniper junos os evolved23.4

Same product

juniper: all records

Other highest-scoring records for the same primary product.

  • CVE-2023-36845Junos OS: EX and SRX Series: A PHP vulnerability in J-Web allows an unauthenticated to control an important environment variableKEV
    98Now
  • CVE-2023-36846Junos OS: SRX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary filesKEV
    79This week
  • CVE-2023-36844Junos OS: EX Series: A PHP vulnerability in J-Web allows an unauthenticated attacker to control important environment variablesKEV
    78This week

Published before and after this one in the same product

  • ← EarlierCVE-2024-39511Jul 10, 2024 · Junos OS: The 802.1X Authentication Daemon crashes on running a specific command
    27Monitor
  • ← EarlierCVE-2024-39514Jul 10, 2024 · Junos OS and Junos OS Evolved: Receiving specific traffic on devices with EVPN-VPWS with IGMP-snooping enabled will cause the rpd to crash
    28Monitor
  • Later →CVE-2024-39518Jul 10, 2024 · Junos OS: MX240, MX480, MX960 platforms using MPC10E: Memory leak will be observed when subscribed to a specific subscription on Junos Telemetry Interface
    34Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Juniper Networks Junos OS21.2R3-S8Vendor (CNA)
Juniper Networks Junos OS21.4R3-S7Vendor (CNA)
Juniper Networks Junos OS22.1R3-S5Vendor (CNA)
Juniper Networks Junos OS22.2R3-S3Vendor (CNA)
Juniper Networks Junos OS22.3R3-S3Vendor (CNA)
Juniper Networks Junos OS22.4R3-S2Vendor (CNA)
Juniper Networks Junos OS23.2R2Vendor (CNA)
Juniper Networks Junos OS23.4R1-S1Vendor (CNA)
Juniper Networks Junos OS Evolved21.2R3-S8-EVOVendor (CNA)
Juniper Networks Junos OS Evolved21.4R3-S7-EVOVendor (CNA)
Juniper Networks Junos OS Evolved22.1R3-S5-EVOVendor (CNA)
Juniper Networks Junos OS Evolved22.2R3-S3-EVOVendor (CNA)
Juniper Networks Junos OS Evolved22.3R3-S3-EVOVendor (CNA)
Juniper Networks Junos OS Evolved22.4R3-S2-EVOVendor (CNA)
Juniper Networks Junos OS Evolved23.2R2-EVOVendor (CNA)
Juniper Networks Junos OS Evolved23.4R1-S1-EVO, 23.4R2-EVOVendor (CNA)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2024-395301 days apartJunos OS: Attempting to access specific sensors on platforms not supporting these will lead to a chassisd crash
    34Monitor
  • CVE-2024-395401 days apartJunos OS: SRX Series, and MX Series with SPC3: Specific valid TCP traffic can cause a pfe crash
    34Monitor
  • CVE-2024-395451 days apartJunos OS: SRX Series, MX Series with SPC3 and NFX350: When VPN tunnels parameters are not configured in specific way the iked process will crash
    34Monitor
  • CVE-2024-3039789 days apartJunos OS: An invalid certificate causes a Denial of Service in the Internet Key Exchange (IKE) process
    34Monitor
  • CVE-2024-4749993 days apartJunos OS and Junos OS Evolved: In a BMP scenario receipt of a malformed AS PATH attribute can cause an RPD crash
    34Monitor
  • CVE-2025-30660273 days apartJunos OS: MX Series: Decapsulation of specific GRE packets leads to PFE reset
    34Monitor

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Not on record for this CVE: EPSS history · patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Someone on the same network segment can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
Integrity
Availability
Attack vector
Adjacent
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
X

Weakness class (CWE)

CWE-754 · Improper Check for Unusual or Exceptional Conditions

CVSS vector

CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records