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CVE-2024-21607

16
FAUCET Score

CVE-2024-21607 is an Unsupported Feature vulnerability in Juniper Networks Junos OS on MX Series and EX9200 Series devices. Specifically, an IPv6 firewall filter configured with "tcp-reset" and "payload-protocol" will incorrectly permit packets instead of rejecting them, leading to a partial integrity impact. This vulnerability has a CVSS score of 5.3 (Medium), indicating it can be exploited by an unauthenticated, network-based attacker with low attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0, < 20.4R3-S7CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 21.1, < 21.1R3-S5CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 21.2, < 21.2R3-S5CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 21.3, < 21.3R3-S4CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
>= 21.4, < 21.4R3-S4CPE match
cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.3MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.31%
Probability of exploitation in next 30 days
EPSS Percentile
23.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0031 is in the 13th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

supportportal.juniper.net / JSA75748
Vendor Advisory
first.org / cvss/calculator/4.0
Third Party Advisory