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CVE-2011-1753· NVD / CVE Program· CNA redhat

expat_erl.c in ejabberd before 2.1.7 and 3.x before 3.0.0-alpha-3, and exmpp before 0.9.7, does not properly detect recursion during entity

expat_erl.c in ejabberd before 2.1.7 and 3.x before 3.0.0-alpha-3, and exmpp before 0.9.7, does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, a similar issue to CVE-2003-1564.

MediumCVSS 5.0 · v2.0—No exploit Fix available
Published
Jun 20, 2011
Updated
Jun 16, 2026
EPSS
2.1% · 81th percentile
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Report tools

JSON

Action score

21

Monitor

Low priority for now.

CVSS
20 / 40 · 5.0 / 10
CISA KEV
0 / 30 · Not listed
EPSS
1 / 30 · 2.1%

Affected systems

VendorProduct
process-oneejabberd
process-oneexmpp

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • process-one ejabberdup to 2.1.6 inclusive
  • process-one ejabberd0.9
  • process-one ejabberd0.9.1
  • process-one ejabberd0.9.8
  • process-one ejabberd1.0.0
  • process-one ejabberd1.1.0
  • process-one ejabberd1.1.1
  • process-one ejabberd1.1.1.0
  • process-one ejabberd1.1.1.1
  • process-one ejabberd1.1.14
  • process-one ejabberd1.1.2
  • process-one ejabberd1.1.3
  • process-one ejabberd2.0.0
  • process-one ejabberd2.0.1_2
  • process-one ejabberd2.0.2
  • process-one ejabberd2.0.3
  • process-one ejabberd2.0.4
  • process-one ejabberd2.0.5
  • process-one ejabberd2.1.0
  • process-one ejabberd2.1.1

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12ejabberdbefore 2.1.6-2.12.1.6-2.1
Debian:5.0ejabberdbefore 2.0.1-6+lenny32.0.1-6+lenny3
Debian:6.0ejabberdbefore 2.1.5-3+squeeze12.1.5-3+squeeze1

Same product

process-one: all records

Other highest-scoring records for the same primary product.

  • CVE-2007-0903Unspecified vulnerability in the mod_roster_odbc module in ejabberd before 1.1.3 has unknown impact and attack vectors.
    41Plan
  • CVE-2010-0305ejabberd_c2s.erl in ejabberd before 2.1.3 allows remote attackers to cause a denial of service (daemon crash) via a large number of c2s (aka
    21Monitor
  • CVE-2014-8760ejabberd before 2.1.13 does not enforce the starttls_required setting when compression is used, which causes clients to establish connection
    20Monitor
  • CVE-2013-6169The TLS driver in ejabberd before 2.1.12 supports (1) SSLv2 and (2) weak SSL ciphers, which makes it easier for remote attackers to obtain s
    17Monitor
  • CVE-2011-4320The mod_pubsub module (mod_pubsub.erl) in ejabberd 2.1.8 and 3.0.0-alpha-3 allows remote authenticated users to cause a denial of service (i
    17Monitor
  • CVE-2009-0934Cross-site scripting (XSS) vulnerability in ejabberd before 2.0.4 allows remote attackers to inject arbitrary web script or HTML via unknown
    17Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:ejabberd2.1.6-2.1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
P · the service can be disrupted
Attack complexity
Low
Confidentiality impact
None
Integrity impact
None
Availability impact
P

Weakness class (CWE)

CWE-399 · Resource Management Errors

CVSS vector

AV:N/AC:L/Au:N/C:N/I:N/A:P

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Noroxi analysis

No Noroxi analysis for this record yet

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Change log

  1. Fix✗ → ✓

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References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records