openHAB is a vendor and technology agnostic open source automation software for your home. In openHAB before versions 2.5.12 and 3.0.1 the XML external entity (XXE) attack allows attackers in the same network as the openHAB instance to retrieve internal information like the content of files from the file system. Responses to SSDP requests can be especially malicious. All add-ons that use SAX or JAXB parsing of externally received XML are potentially subject to this kind of attack. In openHAB, the following add-ons are potentially impacted: AvmFritz, BoseSoundtouch, DenonMarantz, DLinkSmarthome, Enigma2, FmiWeather, FSInternetRadio, Gce, Homematic, HPPrinter, IHC, Insteon, Onkyo, Roku, SamsungTV, Sonos, Roku, Tellstick, TR064, UPnPControl, Vitotronic, Wemo, YamahaReceiver and XPath Tranformation. The vulnerabilities have been fixed in versions 2.5.12 and 3.0.1 by a more strict configuration of the used XML parser.
Published 2021-02-01 15:15:13
Updated 2021-02-05 21:38:20
Source GitHub, Inc.
View at NVD,   CVE.org
Vulnerability category: XML external entity (XXE) injection

Exploit prediction scoring system (EPSS) score for CVE-2021-21266

0.12%
Probability of exploitation activity in the next 30 days EPSS Score History
~ 46 %
Percentile, the proportion of vulnerabilities that are scored at or less

CVSS scores for CVE-2021-21266

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Score Source First Seen
4.0
MEDIUM AV:N/AC:L/Au:S/C:P/I:N/A:N
8.0
2.9
NIST
5.0
MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:N
3.1
1.4
NIST
6.4
MEDIUM CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
3.1
2.7
GitHub, Inc.

CWE ids for CVE-2021-21266

  • The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.
    Assigned by: security-advisories@github.com (Primary)

References for CVE-2021-21266

Products affected by CVE-2021-21266

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