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CVE-2013-4421

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote...

5.0 MediumFix available

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Exploit likelihood

6.42%Up 4.3 points since Feb 4, 2022
90%50%10%1%

What each source reports

NVD Score used 5.0

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Record
CVE-2013-4421
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Weakness
CWE-189
Updated
2026-11-02
CVE List No score

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Record
CVE-2013-4421
Updated
2026-11-02
EUVDEUVD-2013-4298 No score

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Record
EUVD-2013-4298
Updated
2026-11-03
GitHub AdvisoriesGHSA-v8r9-3c3f-g75m No score

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote...

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Record
GHSA-v8r9-3c3f-g75m
Updated
2026-11-02
OSV No score

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Record
CVE-2013-4421
Updated
2026-11-02
OSVDEBIAN-CVE-2013-4421 No score

The buf_decompress function in packet.c in Dropbear SSH Server before 2013.59 allows remote attackers to cause a denial of service (memory consumption) via a compressed packet that has a large size when it is decompressed.

Record
DEBIAN-CVE-2013-4421
Updated
2026-11-02
OSVMGASA-2013-0318 No score

Updated dropbear packages fix CVE-2013-4421

Updated dropbear package fixes security vulnerability:

Possible memory exhaustion denial of service due to the size of decompressed payloads in dropbear before 2013.59 (CVE-2013-4421).

Inconsistent delays in authorization failures could be used to disclose the existence of valid user accounts in dropbear before 2013.59 (CVE-2013-4434).

Record
MGASA-2013-0318
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
dropbear
Debian:12
 before 2012.55-1.4
2012.55-1.4
dropbear
Debian:13
 before 2012.55-1.4
2012.55-1.4
dropbear
Debian:14
 before 2012.55-1.4
2012.55-1.4
dropbear
Mageia:2
From an advisory covering 2 CVEs
 before 2013.59-1.mga2
2013.59-1.mga2
dropbear
Mageia:3
From an advisory covering 2 CVEs
 before 2013.59-1.mga3
2013.59-1.mga3

History

History
RecordedChangedSources
affected, facts
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2013-4421 is a medium vulnerability (CVSS 5.0) in Dropbear Ssh Project Ssh, published October 25, 2013. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 6.42%, the 93rd percentile. Fixed in dropbear 2012.55-1.4.

References

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