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CVE-2020-7248

20
FAUCET Score

CVE-2020-7248 describes a stack-based buffer overflow vulnerability in libubox, a core library used by OpenWrt versions before 18.06.7 and 19.x before 19.07.1. This flaw arises from improper JSON serialization of tagged binary data. With a CVSS score of 7.5 (High), this vulnerability is remotely exploitable with low attack complexity and no user interaction required, potentially leading to a denial of service. There is currently 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
>= 18.06.0, < 18.06.7CPE matchmatch criteria
cpe:2.3:o:openwrt:openwrt:*:*:*:*:*:*:*:*
19.07.0CPE matchmatch criteria
cpe:2.3:o:openwrt:openwrt:19.07.0:-:*:*:*:*:*:*
19.07.0CPE matchmatch criteria
cpe:2.3:o:openwrt:openwrt:19.07.0:rc1:*:*:*:*:*:*
19.07.0CPE matchmatch criteria
cpe:2.3:o:openwrt:openwrt:19.07.0:rc2:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
2.49%
Probability of exploitation in next 30 days
EPSS Percentile
82.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0249 is in the 70th percentile among its peer group of 51,553 CVEs.

Social Chatter

No social media mentions found for this CVE.

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (1)

github_advisorypatch availablevia nvd_reference
View patch

References

github.com / openwrt/openwrt/commits/master
PatchThird Party Advisory
nvd.nist.gov / vuln/detail/CVE-2020-7248
Third Party AdvisoryUS Government Resource
openwrt.org / advisory/2020-01-31-2
Vendor Advisory