Security readout for executives and security teams
Plain-English summary
Gerrit can run out of heap memory because Git operations create Jetty sessions that are not expired. The main business risk is availability: code review and Git workflows may be disrupted. The provided sources do not indicate data theft, code modification, or active exploitation.
Executive priority
Treat this as a moderate availability risk for engineering infrastructure. Prioritize remediation for internet-facing or heavily used Gerrit servers because outages can block code review and deployment workflows.
Technical view
CVE-2021-22553 is a CWE-400 resource-consumption flaw in Gerrit. Git operations pass through Jetty, creating sessions without expiry; repeated operations can accumulate sessions until heap memory is exhausted. CVSS 3.1 is 6.5, with high availability impact and no stated confidentiality or integrity impact.
Likely exposure
Organizations running Gerrit servers are potentially exposed, especially where Git operations are reachable by users or external networks. The source bundle lists affected versions as unspecified, so teams must verify their exact Gerrit version against vendor guidance.
Exploitation context
The CVE is not listed as KEV, and the provided sources do not report active exploitation. The described impact is denial of service through memory exhaustion after multiple Git actions, not remote code execution or data compromise.
Researcher notes
The available data does not name fixed versions or affected version ranges beyond Gerrit. Validation should focus on version confirmation, Jetty session behavior, heap trends, and whether Git operations are exposed to untrusted users.
Mitigation direction
- Upgrade Gerrit to a vendor-recommended fixed release.
- Check the Gerrit issue and vendor guidance for exact fixed versions.
- Reduce unnecessary network exposure to Gerrit Git operations.
- Monitor heap memory until the upgrade is complete.
Validation and detection
- Inventory all Gerrit instances and record exact versions.
- Compare deployed versions with vendor fixed-version guidance.
- Review monitoring for heap growth during Git activity.
- Check server logs for repeated memory pressure or restarts.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-400: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-22553 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://bugs.chromium.org/p/gerrit/issues/detail?id=13858CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Uncontrolled Resource Consumption
Uncontrolled Resource Consumption represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.