CVE-2026-33790
Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 packet will cause the srxpfe process to crash and restart.
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart. Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.
During NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.
This issue cannot be triggered using IPv4 nor other IPv6 traffic.
This issue affects Junos OS on SRX Series:
- all versions before 21.2R3-S10,
- all versions of 21.3,
- from 21.4 before 21.4R3-S12,
- all versions of 22.1,
- from 22.2 before 22.2R3-S8,
- all versions of 22.4,
- from 22.4 before 22.4R3-S9,
- from 23.2 before 23.2R2-S6,
- from 23.4 before 23.4R2-S7,
- from 24.2 before 24.2R2-S3,
- from 24.4 before 24.4R2-S3,
- from 25.2 before 25.2R1-S2, 25.2R2.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
Junos OS: SRX Series: In a NAT64 configuration, receipt of a specific, malformed ICMPv6 packet will cause the srxpfe process to crash and restart.
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart. Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.
During NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.
This issue cannot be triggered using IPv4 nor other IPv6 traffic.
This issue affects Junos OS on SRX Series:
- all versions before 21.2R3-S10,
- all versions of 21.3,
- from 21.4 before 21.4R3-S12,
- all versions of 22.1,
- from 22.2 before 22.2R3-S8,
- all versions of 22.4,
- from 22.4 before 22.4R3-S9,
- from 23.2 before 23.2R2-S6,
- from 23.4 before 23.4R2-S7,
- from 24.2 before 24.2R2-S3,
- from 24.4 before 24.4R2-S3,
- from 25.2 before 25.2R1-S2, 25.2R2.
- Record
CVE-2026-33790- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
EUVDEUVD-2026-21206
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart. Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.
During NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.
This issue cannot be triggered using IPv4 nor other IPv6 traffic.
This issue affects Junos OS on SRX Series:
- all versions before 21.2R3-S10,
- all versions of 21.3,
- from 21.4 before 21.4R3-S12,
- all versions of 22.1,
- from 22.2 before 22.2R3-S8,
- all versions of 22.4,
- from 22.4 before 22.4R3-S9,
- from 23.2 before 23.2R2-S6,
- from 23.4 before 23.4R2-S7,
- from 24.2 before 24.2R2-S3,
- from 24.4 before 24.4R2-S3,
- from 25.2 before 25.2R1-S2, 25.2R2.
- Record
EUVD-2026-21206- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/AU:Y/R:A/V:C/RE:M/U:Amber - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-9cqr-g7fq-8jf6
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd)...
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart. Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.
During NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.
This issue cannot be triggered using IPv4 nor other IPv6 traffic.
This issue affects Junos OS on SRX Series:
- all versions before 21.2R3-S10,
- all versions of 21.3,
- from 21.4 before 21.4R3-S12,
- all versions of 22.1,
- from 22.2 before 22.2R3-S8,
- all versions of 22.4,
- from 22.4 before 22.4R3-S9,
- from 23.2 before 23.2R2-S6,
- from 23.4 before 23.4R2-S7,
- from 24.2 before 24.2R2-S3,
- from 24.4 before 24.4R2-S3,
- from 25.2 before 25.2R1-S2, 25.2R2.
- Record
GHSA-9cqr-g7fq-8jf6- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/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:Y/R:A/V:C/RE:M/U:Amber - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
NVD
An Improper Check for Unusual or Exceptional Conditions vulnerability in the flow daemon (flowd) of Juniper Networks Junos OS on SRX Series allows an attacker sending a specific, malformed ICMPv6 packet to cause the srxpfe process to crash and restart. Continued receipt and processing of these packets will repeatedly crash the srxpfe process and sustain the Denial of Service (DoS) condition.
During NAT64 translation, receipt of a specific, malformed ICMPv6 packet destined to the device will cause the srxpfe process to crash and restart.
This issue cannot be triggered using IPv4 nor other IPv6 traffic.
This issue affects Junos OS on SRX Series:
- all versions before 21.2R3-S10,
- all versions of 21.3,
- from 21.4 before 21.4R3-S12,
- all versions of 22.1,
- from 22.2 before 22.2R3-S8,
- all versions of 22.4,
- from 22.4 before 22.4R3-S9,
- from 23.2 before 23.2R2-S6,
- from 23.4 before 23.4R2-S7,
- from 24.2 before 24.2R2-S3,
- from 24.4 before 24.4R2-S3,
- from 25.2 before 25.2R1-S2, 25.2R2.
- Record
CVE-2026-33790- CVSS 4.0
- 8.7 High
CVSS:4.0/AV:N/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:Y/R:A/V:C/RE:M/U:Amber - CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Weakness
- CWE-754
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2026-33790 is a high vulnerability (CVSS 8.7) in Juniper Junos, published April 9, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.32%, the 25th percentile. No source names a fixed version.