Vulnerability-Lookup

RHSA-2020:5583

Vulnerability from csaf_redhat - Published: 2020-12-16 13:57 - Updated: 2026-11-07 05:26

Summary

Red Hat Security Advisory: memcached security update

Severity

Moderate

Notes

Topic: An update for memcached is now available for Red Hat OpenStack Platform 13 (Queens). Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

Details: memcached is a high-performance, distributed memory object caching system, generic in nature, but intended for use in speeding up dynamic web applications by alleviating database load. Security Fix(es): * null-pointer dereference in "lru mode" and "lru temp_ttl" causing denial of service (CVE-2019-11596) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page listed in the References section.

Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.

CVE-2019-11596

In memcached before 1.5.14, a NULL pointer dereference was found in the "lru mode" and "lru temp_ttl" commands. This causes a denial of service when parsing crafted lru command messages in process_lru_command in memcached.c.

7.5 (High)


                
                  CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE-476 - NULL Pointer Dereference

Affected products

Fixed 8 products

Product	Version	Remediation
Unresolved product id: 7Server-7.6.EUS-RH7-RHOS-13.0:memcached-0:1.4.39-3.el7ost.src	—	Vendor Fix fix
Unresolved product id: 7Server-7.6.EUS-RH7-RHOS-13.0:memcached-0:1.4.39-3.el7ost.x86_64	—	Vendor Fix fix
Unresolved product id: 7Server-7.6.EUS-RH7-RHOS-13.0:memcached-debuginfo-0:1.4.39-3.el7ost.x86_64	—	Vendor Fix fix
Unresolved product id: 7Server-RH7-RHOS-13.0:memcached-0:1.4.39-3.el7ost.ppc64le	—	Vendor Fix fix
Unresolved product id: 7Server-RH7-RHOS-13.0:memcached-0:1.4.39-3.el7ost.src	—	Vendor Fix fix
Unresolved product id: 7Server-RH7-RHOS-13.0:memcached-0:1.4.39-3.el7ost.x86_64	—	Vendor Fix fix
Unresolved product id: 7Server-RH7-RHOS-13.0:memcached-debuginfo-0:1.4.39-3.el7ost.ppc64le	—	Vendor Fix fix
Unresolved product id: 7Server-RH7-RHOS-13.0:memcached-debuginfo-0:1.4.39-3.el7ost.x86_64	—	Vendor Fix fix

Threats

Impact Moderate

References

8 references

URL	Category
https://access.redhat.com/errata/RHSA-2020:5583	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1706001	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2019-11596	self
https://bugzilla.redhat.com/show_bug.cgi?id=1706001	external
https://www.cve.org/CVERecord?id=CVE-2019-11596	external
https://nvd.nist.gov/vuln/detail/CVE-2019-11596	external

JSON

To clipboard

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      },
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          "text": "1706001"
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          "text": "In memcached before 1.5.14, a NULL pointer dereference was found in the \"lru mode\" and \"lru temp_ttl\" commands. This causes a denial of service when parsing crafted lru command messages in process_lru_command in memcached.c.",
          "title": "Vulnerability description"
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          "category": "summary",
          "text": "memcached: null-pointer dereference in \"lru mode\" and \"lru temp_ttl\" causing denial of service",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "The vulnerable code is not present in the versions of memcached as shipped in Red Hat Enterprise Linux 6 and 7, so they are not affected by this flaw.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
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        {
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1706001"
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            "attackVector": "NETWORK",
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            "baseScore": 7.5,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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        }
      ],
      "threats": [
        {
          "category": "impact",
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      ],
      "title": "memcached: null-pointer dereference in \"lru mode\" and \"lru temp_ttl\" causing denial of service"
    }
  ]
}

CVE-2019-11596 (GCVE-0-2019-11596)

Vulnerability from cvelistv5 – Published: 2019-04-29 14:46 – Updated: 2024-08-04 22:55

Summary

Severity

No CVSS data available.

CWE

Assigner

mitre CNA under the mitre root

CNA scorecard E 29/100 over 2230 records in the last 180 days details

References

7 references

URL	Tags
https://github.com/memcached/memcached/issues/474	x_refsource_MISC
https://github.com/memcached/memcached/commit/d35…	x_refsource_MISC
https://github.com/memcached/memcached/compare/ee…	x_refsource_MISC
https://usn.ubuntu.com/3963-1/	vendor-advisoryx_refsource_UBUNTU
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
http://lists.opensuse.org/opensuse-security-annou…	vendor-advisoryx_refsource_SUSE

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

Order JSON

How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

Publication & reservation Sightings KEV catalogs Other timestamps

Loading timeline…

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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