CVE-2023-36838· NVD / CVE Program· CNA juniper

Junos OS: SRX Series: A flowd core occurs when running a low privileged CLI command

An Out-of-bounds Read vulnerability in the flow processing daemon (flowd) of Juniper Networks Junos OS on SRX Series allows a local, authenticated attacker with low privileges, to cause a Denial of Service (DoS). If a low privileged user executes a specific CLI command, flowd which is responsible for traffic forwarding in SRX crashes and generates a core dump. This will cause temporary traffic interruption until the flowd process is restarted automatically. Continued execution of this command will lead to a sustained DoS. This issue affects Juniper Networks Junos OS on SRX Series: All versions prior to 20.2R3-S7; 20.3 version 20.3R1 and later versions; 20.4 versions prior to 20.4R3-S6; 21.1 versions prior to 21.1R3-S5; 21.2 versions prior to 21.2R3-S4; 21.3 versions prior to 21.3R3-S4; 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S1; 22.2 versions prior to 22.2R3; 22.3 versions prior to 22.3R2; 22.4 versions prior to 22.4R1-S1, 22.4R2.

MediumCVSS 5.5 · v3.1—No exploit No fix recorded

BDU:2023-07466

Noroxi analysis

No Noroxi analysis for this record yet

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Published: Jul 14, 2023
Updated: Jun 17, 2026
EPSS: 0.2% · 7th percentile
CWE: CWE-125

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.5 / 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: 5.5; NVD has not scored this yet; the score shown is the CNA’s.

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

Affected systems

Vendor	Product	CPE
juniper	junos	cpe:2.3:o:juniper:junos
juniper	vsrx	cpe:2.3:a:juniper:vsrx
juniper	csrx	cpe:2.3:h:juniper:csrx
juniper	srx100	cpe:2.3:h:juniper:srx100
juniper	srx110	cpe:2.3:h:juniper:srx110
juniper	srx1400	cpe:2.3:h:juniper:srx1400
juniper	srx1500	cpe:2.3:h:juniper:srx1500
juniper	srx210	cpe:2.3:h:juniper:srx210
juniper	srx220	cpe:2.3:h:juniper:srx220
juniper	srx240	cpe:2.3:h:juniper:srx240
juniper	srx240h2	cpe:2.3:h:juniper:srx240h2
juniper	srx240m	cpe:2.3:h:juniper:srx240m

and 19 more

Affected versions

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

juniper junosbefore 20.2
juniper junos20.2
juniper junos20.3
juniper junos20.4
juniper junos21.1
juniper junos21.2
juniper junos21.3
juniper junos21.4
juniper junos22.1
juniper junos22.2
juniper junos22.3
juniper junos22.4

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
- unspecified and later · before 20.2R3-S7affected
- 20.3 and later · before 20.3*affected
- 20.4 and later · before 20.4R3-S6affected
- 21.1 and later · before 21.1R3-S5affected
- 21.2 and later · before 21.2R3-S4affected
- 21.3 and later · before 21.3R3-S4affected
- 21.4 and later · before 21.4R3-S3affected
- 22.1 and later · before 22.1R3-S1affected
- 22.2 and later · before 22.2R3affected
- 22.3 and later · before 22.3R2affected

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
CVE-2023-36847Junos OS: EX Series: A vulnerability in J-Web allows an unauthenticated attacker to upload arbitrary filesKEV
76This week
CVE-2020-1631Out of Cycle Security Advisory: Junos OS: Security vulnerability in J-Web and web based (HTTP/HTTPS) servicesKEV
70This week
CVE-2025-21590Junos OS: An local attacker with shell access can execute arbitrary codeKEV
57Plan

Remediation

Which version to upgrade to

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

No fix version is recorded for this entry. Check the references for vendor advisories.

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.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

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

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).