CVE-2025-59969: A Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the advanced forward

Q: How do I fix CVE-2025-59969?

junos os evolved: upgrade to 22.4. Exact commands for each OS are on this page.

Q: Is CVE-2025-59969 being exploited?

CVE-2025-59969 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-59969 affect?

CVE-2025-59969 affects junos os evolved. Severity is medium (CVSS 6.5). A Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the advanced forwarding toolkit (evo-aftmand/evo-pfemand) of Juniper Networks Junos OS Evolved on PTX Series or QFX5000 Series allows an unauthenticat

Q: How urgent is CVE-2025-59969?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2025-59969 is a medium-severity flaw (CVSS 6.5) affecting junos os evolved. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the advanced forwarding toolkit (evo-aftmand/evo-pfemand) of Juniper Networks Junos OS Evolved on PTX Series or QFX5000 Series allows an unauthenticated, adjacent attacker to cause a Denial of Service (DoS).An attacker sending crafted multicast packets will cause line cards running evo-aftmand/evo-pfemand to crash and restart or non-line card devices to cras

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-120
Published	2026-04-09
Last modified	2026-10-07

Publisher (CNA): Juniper Networks, Inc. · Vendor: juniper

Last updated 2026-10-07 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-09 22:16 UTCPublished CVE record published
2026-10-07 09:10 UTCUpdated Record last modified

juniper junos os evolved UPGRADE

Affected: < 22.4 · 22.4 · 22.4 r1 · 22.4 r1-s1 · 22.4 r1-s2 · 22.4 r2 · 22.4 r2-s1 · 22.4 r2-s2

Fixed in: 22.4

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-59969?

junos os evolved: upgrade to 22.4. Exact commands for each OS are on this page.

Is CVE-2025-59969 being exploited?

CVE-2025-59969 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-59969 affect?

CVE-2025-59969 affects junos os evolved. Severity is medium (CVSS 6.5). A Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') vulnerability in the advanced forwarding toolkit (evo-aftmand/evo-pfemand) of Juniper Networks Junos OS Evolved on PTX Series or QFX5000 Series allows an unauthenticat

How urgent is CVE-2025-59969?

Priority 25/100. No elevated risk signals yet.

Software pages

Juniper Junos vulnerabilities

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References

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