CVE-2021-0249

highpriority · track · 40EPSS 0.018 · 79 %ileEUUS

grimoire priorityP2 · Scheduled

Exploitable?

—

no known exploitation

Likely / severe?

1.84% (79th) EPSS

CVSS 10 · high

Is it mine?

16 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

On SRX Series devices configured with UTM services a buffer overflow vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS may allow an attacker to arbitrarily execute code or commands on the target to take over or otherwise impact the device by sending crafted packets to or through the device. This issue affects: Juniper Networks Junos OS on SRX Series: 15.1X49 versions prior to 15.1X49-D190; 17.4 versions prior to 17.4R2-S9; 17.4R3 and later versions prior to 18.1R3-S9; 18.2 versions prior to 18.2R3-S1; 18.3 versions prior to 18.3R2-S3, 18.3R3; 18.4 versions prior to 18.4R2-S3, 18.4R3; 19.1 versions prior to 19.1R1-S4, 19.1R2; 19.2 versions prior to 19.2R1-S1, 19.2R2. An indicator of compromise can be the following text in the UTM log: RT_UTM: AV_FILE_NOT_SCANNED_PASSED_MT:

cvss

Technical severity, 0–10. One row per scoring source.

10.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 8.1–10

v2.010highAV:N/AC:L/Au:N/C:C/I:C/A:Cprimary · NVD / NIST USexploitability 10 · impact 10

v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU

v3.18.1highCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · sirt@juniper.net USexploitability 2.2 · impact 5.9

v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-120USprimary

affected products (16)

Products and version ranges known to be affected.

Juniper Networks Junos OS15.1X49 → 15.1X49-D190enisa_euvdEU
Juniper Networks Junos OS17.4 → 17.4R2-S9enisa_euvdEU
Juniper Networks Junos OS18.1 → 18.1R3-S9enisa_euvdEU
Juniper Networks Junos OS18.2 → 18.2R3-S1enisa_euvdEU
Juniper Networks Junos OS18.3 → 18.3R2-S3, 18.3R3enisa_euvdEU
Juniper Networks Junos OS18.4 → 18.4R2-S3, 18.4R3enisa_euvdEU
Juniper Networks Junos OS19.1 → 19.1R1-S4, 19.1R2enisa_euvdEU
Juniper Networks Junos OS19.2 → 19.2R1-S1, 19.2R2enisa_euvdEU
juniper junos= 15.1x49nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 17.4nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 18.1nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 18.2nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 18.3nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 18.4nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 19.1nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
juniper junos= 19.2nvdUScpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-04-22modified 2026-06-17

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+5663 more

references (6)

External citations — patches, advisories, analysis.

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