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CVE-2021-0273

20
FAUCET Score

CVE-2021-0273 is a Denial of Service (DoS) vulnerability affecting Juniper Networks Junos OS and Junos OS Evolved on specific ACX5800, EX9200, MX10000, MX240, MX480, and MX960 devices equipped with certain Trio line cards. An attacker can exploit an incorrect control flow in implicit filter terms, causing packets destined for Logical Tunnel (LT) interfaces to enter an infinite loop, leading to a sustained DoS. The vulnerability has a CVSS score of 5.3 (Medium), indicating a network-based attack with low complexity and no user interaction required, resulting in a loss of availability. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
15.1CPE matchmatch criteria
cpe:2.3:o:juniper:junos:15.1:f6:*:*:*:*:*:*
15.1CPE matchmatch criteria
cpe:2.3:o:juniper:junos:15.1:f6-s1:*:*:*:*:*:*
15.1CPE matchmatch criteria
cpe:2.3:o:juniper:junos:15.1:f6-s10:*:*:*:*:*:*
15.1CPE matchmatch criteria
cpe:2.3:o:juniper:junos:15.1:f6-s12:*:*:*:*:*:*
15.1CPE matchmatch criteria
cpe:2.3:o:juniper:junos:15.1:f6-s2:*:*:*:*:*:*

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:N/A:L

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

Exploit Intelligence

EPSS Score
1.00%
Probability of exploitation in next 30 days
EPSS Percentile
59.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0100 is in the 37th percentile among its peer group of 23,705 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

Vendor Patches (1)

junipervendor investigatingvia nvd_reference
View patch

References

kb.juniper.net / JSA11164
Vendor Advisory